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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/public/browser/scoped_accessibility_mode.h"
#include <memory>
#include <utility>
#include "base/memory/raw_ptr.h"
#include "base/notreached.h"
#include "base/run_loop.h"
#include "base/scoped_observation.h"
#include "base/strings/escape.h"
#include "base/task/sequenced_task_runner.h"
#include "base/test/bind.h"
#include "base/test/scoped_feature_list.h"
#include "content/browser/accessibility/browser_accessibility_state_impl.h"
#include "content/browser/accessibility/render_accessibility_host.h"
#include "content/browser/web_contents/web_contents_impl.h"
#include "content/public/browser/browser_accessibility_state.h"
#include "content/public/browser/web_contents.h"
#include "content/public/test/accessibility_notification_waiter.h"
#include "content/public/test/browser_test.h"
#include "content/public/test/content_browser_test.h"
#include "content/public/test/content_browser_test_utils.h"
#include "content/shell/browser/shell.h"
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "ui/accessibility/accessibility_features.h"
#include "ui/accessibility/ax_mode.h"
#include "ui/accessibility/platform/ax_mode_observer.h"
#include "ui/accessibility/platform/ax_platform.h"
namespace content {
using ::testing::_;
namespace {
class MockAXModeObserver : public ui::AXModeObserver {
public:
MOCK_METHOD(void, OnAXModeAdded, (ui::AXMode mode), (override));
};
} // namespace
// A test for ScopedAccessibilityModes vended by BrowserAccessibilityState.
class ScopedAccessibilityModeTest : public ContentBrowserTest {
protected:
ScopedAccessibilityModeTest() = default;
void SetUpOnMainThread() override {
ContentBrowserTest::SetUpOnMainThread();
accessibility_state_ = BrowserAccessibilityState::GetInstance();
// Get the initial BrowserContext and WebContents created by
// ContentBrowserTest.
auto* const default_shell = shell();
browser_context1_ = default_shell->web_contents()->GetBrowserContext();
web_contents1_ = default_shell->web_contents();
// Create a second WebContents belonging to the initial BrowserContext.
web_contents2_ = CreateBrowser()->web_contents();
// Create a third WebContents belonging to a distinct BrowserContext.
web_contents3_ = CreateOffTheRecordBrowser()->web_contents();
browser_context2_ = web_contents3_->GetBrowserContext();
}
void TearDownOnMainThread() override {
// Forget about the WebContentses and BrowserContext -- ContentBrowserTest
// will clean them up.
web_contents3_ = nullptr;
browser_context2_ = nullptr;
web_contents2_ = nullptr;
web_contents1_ = nullptr;
browser_context1_ = nullptr;
accessibility_state_ = nullptr;
ContentBrowserTest::TearDownOnMainThread();
}
BrowserAccessibilityState& accessibility_state() {
return *accessibility_state_;
}
// The initial BrowserContext and its two WebContentses.
BrowserContext& browser_context1() { return *browser_context1_; }
WebContents& web_contents1() { return *web_contents1_; }
WebContents& web_contents2() { return *web_contents2_; }
// The second BrowserContext and its WebContents.
BrowserContext& browser_context2() { return *browser_context2_; }
WebContents& web_contents3() { return *web_contents3_; }
#if BUILDFLAG(IS_WIN)
static constexpr ui::AXMode kIgnoredModeFlags{ui::AXMode::kNativeAPIs};
#else
static constexpr ui::AXMode kIgnoredModeFlags{};
#endif
private:
raw_ptr<BrowserAccessibilityState> accessibility_state_ = nullptr;
raw_ptr<BrowserContext> browser_context1_ = nullptr;
raw_ptr<WebContents> web_contents1_ = nullptr;
raw_ptr<WebContents> web_contents2_ = nullptr;
raw_ptr<BrowserContext> browser_context2_ = nullptr;
raw_ptr<WebContents> web_contents3_ = nullptr;
};
// Matches `arg` if it equals `flags`, ignoring those in `ignored_flags`. This
// is required on Windows, where kNativeAPIs may be turned on when a window
// receives focus; see https://crbug.com/1447827.
MATCHER_P2(EqualsIgnoring, flags, ignored_flags, "") {
return (arg & ~ignored_flags) == (flags & ~ignored_flags);
}
// Verifies that all WebContentses in the process receive mode flags targeting
// the process.
IN_PROC_BROWSER_TEST_F(ScopedAccessibilityModeTest, Process) {
::testing::StrictMock<MockAXModeObserver> mock_observer;
base::ScopedObservation<ui::AXPlatform, ui::AXModeObserver> observation(
&mock_observer);
observation.Observe(&ui::AXPlatform::GetInstance());
// Accessibility is off to start with.
ASSERT_EQ(web_contents1().GetAccessibilityMode() & ~kIgnoredModeFlags,
ui::AXMode());
ASSERT_EQ(web_contents2().GetAccessibilityMode() & ~kIgnoredModeFlags,
ui::AXMode());
ASSERT_EQ(web_contents3().GetAccessibilityMode() & ~kIgnoredModeFlags,
ui::AXMode());
// Add the basic flags to the process and verify that observers were notified
// and that they were applied to all WebContentses.
EXPECT_CALL(mock_observer, OnAXModeAdded(EqualsIgnoring(ui::kAXModeBasic,
kIgnoredModeFlags)));
auto scoped_mode_1 =
accessibility_state().CreateScopedModeForProcess(ui::kAXModeBasic);
::testing::Mock::VerifyAndClearExpectations(&mock_observer);
EXPECT_EQ(web_contents1().GetAccessibilityMode(), ui::kAXModeBasic);
EXPECT_EQ(web_contents2().GetAccessibilityMode(), ui::kAXModeBasic);
EXPECT_EQ(web_contents3().GetAccessibilityMode(), ui::kAXModeBasic);
// Now add the complete flags and verify.
EXPECT_CALL(mock_observer, OnAXModeAdded(EqualsIgnoring(ui::kAXModeComplete,
ui::kAXModeBasic)));
auto scoped_mode_2 =
accessibility_state().CreateScopedModeForProcess(ui::kAXModeComplete);
::testing::Mock::VerifyAndClearExpectations(&mock_observer);
EXPECT_EQ(web_contents1().GetAccessibilityMode(), ui::kAXModeComplete);
EXPECT_EQ(web_contents2().GetAccessibilityMode(), ui::kAXModeComplete);
EXPECT_EQ(web_contents3().GetAccessibilityMode(), ui::kAXModeComplete);
// Release the basic flags and verify that complete still applies.
scoped_mode_1.reset();
::testing::Mock::VerifyAndClearExpectations(&mock_observer);
EXPECT_EQ(web_contents1().GetAccessibilityMode(), ui::kAXModeComplete);
EXPECT_EQ(web_contents2().GetAccessibilityMode(), ui::kAXModeComplete);
EXPECT_EQ(web_contents3().GetAccessibilityMode(), ui::kAXModeComplete);
// Release the complete flags and verify that all flags are cleared.
scoped_mode_2.reset();
::testing::Mock::VerifyAndClearExpectations(&mock_observer);
EXPECT_EQ(web_contents1().GetAccessibilityMode() & ~kIgnoredModeFlags,
ui::AXMode());
EXPECT_EQ(web_contents2().GetAccessibilityMode() & ~kIgnoredModeFlags,
ui::AXMode());
EXPECT_EQ(web_contents3().GetAccessibilityMode() & ~kIgnoredModeFlags,
ui::AXMode());
}
// Verifies that only WebContentses belonging to a specific BrowserContext
// receive mode flags targeting that BrowserContext.
IN_PROC_BROWSER_TEST_F(ScopedAccessibilityModeTest, BrowserContext) {
// Accessibility is off to start with.
ASSERT_EQ(web_contents1().GetAccessibilityMode() & ~kIgnoredModeFlags,
ui::AXMode());
ASSERT_EQ(web_contents2().GetAccessibilityMode() & ~kIgnoredModeFlags,
ui::AXMode());
ASSERT_EQ(web_contents3().GetAccessibilityMode() & ~kIgnoredModeFlags,
ui::AXMode());
ASSERT_EQ(accessibility_state().GetAccessibilityModeForBrowserContext(
&browser_context1()) &
~kIgnoredModeFlags,
ui::AXMode());
ASSERT_EQ(accessibility_state().GetAccessibilityModeForBrowserContext(
&browser_context2()) &
~kIgnoredModeFlags,
ui::AXMode());
// Add the basic flags to all WebContentses for the first BrowserContext and
// verify that they were applied only to its WebContentses.
auto scoped_mode_1 = accessibility_state().CreateScopedModeForBrowserContext(
&browser_context1(), ui::kAXModeBasic);
EXPECT_EQ(web_contents1().GetAccessibilityMode(), ui::kAXModeBasic);
EXPECT_EQ(web_contents2().GetAccessibilityMode(), ui::kAXModeBasic);
EXPECT_EQ(web_contents3().GetAccessibilityMode() & ~kIgnoredModeFlags,
ui::AXMode());
EXPECT_EQ(accessibility_state().GetAccessibilityModeForBrowserContext(
&browser_context1()),
ui::kAXModeBasic);
EXPECT_EQ(accessibility_state().GetAccessibilityModeForBrowserContext(
&browser_context2()) &
~kIgnoredModeFlags,
ui::AXMode());
// Now add the complete flags and verify that they were applied.
auto scoped_mode_2 = accessibility_state().CreateScopedModeForBrowserContext(
&browser_context1(), ui::kAXModeComplete);
EXPECT_EQ(web_contents1().GetAccessibilityMode(), ui::kAXModeComplete);
EXPECT_EQ(web_contents2().GetAccessibilityMode(), ui::kAXModeComplete);
EXPECT_EQ(web_contents3().GetAccessibilityMode() & ~kIgnoredModeFlags,
ui::AXMode());
EXPECT_EQ(accessibility_state().GetAccessibilityModeForBrowserContext(
&browser_context1()),
ui::kAXModeComplete);
EXPECT_EQ(accessibility_state().GetAccessibilityModeForBrowserContext(
&browser_context2()) &
~kIgnoredModeFlags,
ui::AXMode());
// Release the basic flags and verify that complete still applies.
scoped_mode_1.reset();
EXPECT_EQ(web_contents1().GetAccessibilityMode(), ui::kAXModeComplete);
EXPECT_EQ(web_contents2().GetAccessibilityMode(), ui::kAXModeComplete);
EXPECT_EQ(web_contents3().GetAccessibilityMode() & ~kIgnoredModeFlags,
ui::AXMode());
EXPECT_EQ(accessibility_state().GetAccessibilityModeForBrowserContext(
&browser_context1()),
ui::kAXModeComplete);
EXPECT_EQ(accessibility_state().GetAccessibilityModeForBrowserContext(
&browser_context2()) &
~kIgnoredModeFlags,
ui::AXMode());
// Release the complete flags and verify that all flags are cleared.
scoped_mode_2.reset();
EXPECT_EQ(web_contents1().GetAccessibilityMode() & ~kIgnoredModeFlags,
ui::AXMode());
EXPECT_EQ(web_contents2().GetAccessibilityMode() & ~kIgnoredModeFlags,
ui::AXMode());
EXPECT_EQ(web_contents3().GetAccessibilityMode() & ~kIgnoredModeFlags,
ui::AXMode());
EXPECT_EQ(accessibility_state().GetAccessibilityModeForBrowserContext(
&browser_context1()) &
~kIgnoredModeFlags,
ui::AXMode());
EXPECT_EQ(accessibility_state().GetAccessibilityModeForBrowserContext(
&browser_context2()) &
~kIgnoredModeFlags,
ui::AXMode());
}
// Verifies that only a targeted WebContentses receives mode flags.
IN_PROC_BROWSER_TEST_F(ScopedAccessibilityModeTest, WebContents) {
// Accessibility is off to start with.
ASSERT_EQ(web_contents1().GetAccessibilityMode() & ~kIgnoredModeFlags,
ui::AXMode());
ASSERT_EQ(web_contents2().GetAccessibilityMode() & ~kIgnoredModeFlags,
ui::AXMode());
ASSERT_EQ(web_contents3().GetAccessibilityMode() & ~kIgnoredModeFlags,
ui::AXMode());
// Add the basic flags to the WebContext and verify that they were applied.
auto scoped_mode_1 = accessibility_state().CreateScopedModeForWebContents(
&web_contents1(), ui::kAXModeBasic);
EXPECT_EQ(web_contents1().GetAccessibilityMode(), ui::kAXModeBasic);
EXPECT_EQ(web_contents2().GetAccessibilityMode() & ~kIgnoredModeFlags,
ui::AXMode());
EXPECT_EQ(web_contents3().GetAccessibilityMode() & ~kIgnoredModeFlags,
ui::AXMode());
// Now add the complete flags and verify that they were applied.
auto scoped_mode_2 = accessibility_state().CreateScopedModeForWebContents(
&web_contents1(), ui::kAXModeComplete);
EXPECT_EQ(web_contents1().GetAccessibilityMode(), ui::kAXModeComplete);
EXPECT_EQ(web_contents2().GetAccessibilityMode() & ~kIgnoredModeFlags,
ui::AXMode());
EXPECT_EQ(web_contents3().GetAccessibilityMode() & ~kIgnoredModeFlags,
ui::AXMode());
// Release the basic flags and verify that complete still applies.
scoped_mode_1.reset();
EXPECT_EQ(web_contents1().GetAccessibilityMode(), ui::kAXModeComplete);
EXPECT_EQ(web_contents2().GetAccessibilityMode() & ~kIgnoredModeFlags,
ui::AXMode());
EXPECT_EQ(web_contents3().GetAccessibilityMode() & ~kIgnoredModeFlags,
ui::AXMode());
// Release the complete flags and verify that all flags are cleared.
scoped_mode_2.reset();
ASSERT_EQ(web_contents1().GetAccessibilityMode() & ~kIgnoredModeFlags,
ui::AXMode());
EXPECT_EQ(web_contents2().GetAccessibilityMode() & ~kIgnoredModeFlags,
ui::AXMode());
EXPECT_EQ(web_contents3().GetAccessibilityMode() & ~kIgnoredModeFlags,
ui::AXMode());
}
// Verifies that filtering results in a WebContents receives various web flags
// only when web accessibility is enabled.
IN_PROC_BROWSER_TEST_F(ScopedAccessibilityModeTest, Filtering) {
// Accessibility is off to start with.
ASSERT_EQ(web_contents1().GetAccessibilityMode() & ~kIgnoredModeFlags,
ui::AXMode());
// Enable basic accessibility for the process.
auto process_mode =
accessibility_state().CreateScopedModeForProcess(ui::kAXModeBasic);
// The WebContents gets it.
ASSERT_EQ(web_contents1().GetAccessibilityMode() & ~kIgnoredModeFlags,
(ui::kAXModeBasic) & ~kIgnoredModeFlags);
// Add image labeling for the WebContents.
auto wc_mode = accessibility_state().CreateScopedModeForWebContents(
&web_contents1(), ui::AXMode::kLabelImages);
// The WebContents doesn't get kLabelImages until kExtendedProperties appears.
ASSERT_EQ(web_contents1().GetAccessibilityMode() & ~kIgnoredModeFlags,
ui::kAXModeBasic & ~kIgnoredModeFlags);
process_mode =
accessibility_state().CreateScopedModeForProcess(ui::kAXModeComplete);
ASSERT_EQ(
web_contents1().GetAccessibilityMode() & ~kIgnoredModeFlags,
(ui::kAXModeComplete | ui::AXMode::kLabelImages) & ~kIgnoredModeFlags);
}
// Verifies that usage from the platform will set AXModes and that if the
// AXModes do not change, platform still have the chance to discover assistive
// technology in case we have enough signals of a screen reader may be running.
IN_PROC_BROWSER_TEST_F(ScopedAccessibilityModeTest, AXModesFromPlatform) {
// Set changes from platform, as this is turned off by default for tests.
accessibility_state().SetActivationFromPlatformEnabled(true);
// Accessibility is off to start with.
ASSERT_EQ(web_contents1().GetAccessibilityMode() & ~kIgnoredModeFlags,
ui::AXMode());
ui::AXPlatform::GetInstance().OnPropertiesUsedInBrowserUI();
ASSERT_EQ(accessibility_state().GetAccessibilityMode(),
ui::AXMode(ui::AXMode::kNativeAPIs));
ui::AXPlatform::GetInstance().OnExtendedPropertiesUsedInWebContent();
ASSERT_EQ(accessibility_state().GetAccessibilityMode(),
ui::kAXModeBasic | ui::AXMode::kExtendedProperties);
ui::AXPlatform::GetInstance().OnInlineTextBoxesUsedInWebContent();
ASSERT_EQ(accessibility_state().GetAccessibilityMode(), ui::kAXModeComplete);
// Configure the detection of a screen reader, that will be triggered the next
// time a page loads. Since the AXMode is already kAXModeComplete, there will
// be no change in the AXMode the next time the platforms tries to access
// accessibility APIs.
std::unique_ptr<ScopedAccessibilityMode> screen_reader_mode;
BrowserAccessibilityStateImpl::GetInstance()
->SetDiscoverAssistiveTechnologyCallbackForTesting(
base::BindLambdaForTesting([&]() {
BrowserAccessibilityStateImpl::GetInstance()->OnAssistiveTechFound(
ui::AssistiveTech::kGenericScreenReader);
screen_reader_mode =
accessibility_state().CreateScopedModeForProcess(
ui::kAXModeComplete | ui::AXMode::kScreenReader);
}));
ui::AXPlatform::GetInstance().OnExtendedPropertiesUsedInWebContent();
// The mode will not change because it is already complete, so the discovery
// phase of ATs did not run yet.
ASSERT_FALSE(screen_reader_mode);
ASSERT_FALSE(accessibility_state().GetAccessibilityMode().has_mode(
ui::AXMode::kScreenReader));
const std::string html = "<p>Hello World</p>";
GURL url("data:text/html," + base::EscapeQueryParamValue(html, false));
EXPECT_TRUE(NavigateToURL(shell(), url));
// Simulate an action coming from ATs, which likely indicates a potential
// screen reader.
ui::AXPlatform::GetInstance().OnActionFromAssistiveTech();
ASSERT_EQ(web_contents1().GetAccessibilityMode(),
ui::kAXModeComplete | ui::AXMode::kScreenReader);
BrowserAccessibilityStateImpl::GetInstance()
->SetDiscoverAssistiveTechnologyCallbackForTesting({});
}
class AccessibilityPerformanceMeasurementExperimentTest
: public ScopedAccessibilityModeTest,
public testing::WithParamInterface<std::string> {
protected:
AccessibilityPerformanceMeasurementExperimentTest() {
// Initialize the feature and its parameters before the browser is
// created, as its value is accessed during browser initialization. Please
// see base::test::ScopedFeatureList documentation for more details. Note
// that `GetParam()`will be instantiated for each test case with the
// possible experiment groups.
feature_list_.InitAndEnableFeatureWithParameters(
features::kAccessibilityPerformanceMeasurementExperiment,
{{"accessibility_performance_group_name", GetParam()}});
}
static ui::AXMode ExpectedAXModeForExperimentGroup() {
if (GetParam() == "AXModeComplete") {
return ui::kAXModeComplete & ~kIgnoredModeFlags;
}
if (GetParam() == "WebContentsOnly") {
return ui::kAXModeBasic & ~kIgnoredModeFlags;
}
if (GetParam() == "AXModeCompleteNoInlineTextBoxes") {
return (ui::kAXModeComplete & ~ui::AXMode::kInlineTextBoxes) &
~kIgnoredModeFlags;
}
if (GetParam() == "RendererSerializationOnly") {
return ui::kAXModeComplete & ~kIgnoredModeFlags;
}
NOTREACHED();
}
void WaitForExperimentShutDown() {
base::RunLoop loop;
base::RepeatingClosure check_task; // Declare upfront for self-capture
check_task = base::BindLambdaForTesting([&]() {
if (!accessibility_state()
.IsAccessibilityPerformanceMeasurementExperimentActive()) {
return loop.Quit();
}
base::SequencedTaskRunner::GetCurrentDefault()->PostDelayedTask(
FROM_HERE, check_task, base::Milliseconds(10));
});
base::SequencedTaskRunner::GetCurrentDefault()->PostTask(FROM_HERE,
check_task);
loop.Run();
}
base::test::ScopedFeatureList feature_list_;
};
INSTANTIATE_TEST_SUITE_P(AXModeComplete,
AccessibilityPerformanceMeasurementExperimentTest,
testing::Values("AXModeComplete"));
INSTANTIATE_TEST_SUITE_P(WebContentsOnly,
AccessibilityPerformanceMeasurementExperimentTest,
testing::Values("WebContentsOnly"));
INSTANTIATE_TEST_SUITE_P(AXModeCompleteNoInlineTextBoxes,
AccessibilityPerformanceMeasurementExperimentTest,
testing::Values("AXModeCompleteNoInlineTextBoxes"));
INSTANTIATE_TEST_SUITE_P(RendererSerializationOnly,
AccessibilityPerformanceMeasurementExperimentTest,
testing::Values("RendererSerializationOnly"));
// Verifies that when the feature
// `AccessibilityPerformanceMeasurementExperiment`is enabled, it modifies the
// AXModes.
IN_PROC_BROWSER_TEST_P(
AccessibilityPerformanceMeasurementExperimentTest,
AccessibilityPerformanceMeasurementExperimentChangesAXModes) {
ASSERT_TRUE(
features::IsAccessibilityPerformanceMeasurementExperimentEnabled());
ASSERT_TRUE(accessibility_state()
.IsAccessibilityPerformanceMeasurementExperimentActive());
// The AXModes must be the ones coming from the experiment group.
ASSERT_EQ(web_contents1().GetAccessibilityMode() & ~kIgnoredModeFlags,
ExpectedAXModeForExperimentGroup());
ASSERT_EQ(web_contents2().GetAccessibilityMode() & ~kIgnoredModeFlags,
ExpectedAXModeForExperimentGroup());
ASSERT_EQ(web_contents3().GetAccessibilityMode() & ~kIgnoredModeFlags,
ExpectedAXModeForExperimentGroup());
// Set a new AXMode, which will cause the experiment to stop running and the
// new AXMode to be only the one being set.
auto scoped_mode = accessibility_state().CreateScopedModeForProcess(
ui::kAXModeBasic & ~kIgnoredModeFlags);
WaitForExperimentShutDown();
ASSERT_FALSE(accessibility_state()
.IsAccessibilityPerformanceMeasurementExperimentActive());
EXPECT_EQ(web_contents1().GetAccessibilityMode() & ~kIgnoredModeFlags,
ui::kAXModeBasic & ~kIgnoredModeFlags);
EXPECT_EQ(web_contents2().GetAccessibilityMode() & ~kIgnoredModeFlags,
ui::kAXModeBasic & ~kIgnoredModeFlags);
EXPECT_EQ(web_contents3().GetAccessibilityMode() & ~kIgnoredModeFlags,
ui::kAXModeBasic & ~kIgnoredModeFlags);
}
// Verifies that when the experiment is running, it gets turned off in case a
// BrowserContext has AXModes set.
IN_PROC_BROWSER_TEST_P(AccessibilityPerformanceMeasurementExperimentTest,
ExperimentStopsAfterAXModeChangesForBrowserContext) {
ASSERT_TRUE(
features::IsAccessibilityPerformanceMeasurementExperimentEnabled());
ASSERT_TRUE(accessibility_state()
.IsAccessibilityPerformanceMeasurementExperimentActive());
auto scoped_mode = accessibility_state().CreateScopedModeForBrowserContext(
&browser_context1(), ui::kAXModeComplete);
WaitForExperimentShutDown();
ASSERT_FALSE(accessibility_state()
.IsAccessibilityPerformanceMeasurementExperimentActive());
EXPECT_EQ(web_contents1().GetAccessibilityMode() & ~kIgnoredModeFlags,
ui::kAXModeComplete & ~kIgnoredModeFlags);
EXPECT_EQ(web_contents2().GetAccessibilityMode() & ~kIgnoredModeFlags,
ui::kAXModeComplete & ~kIgnoredModeFlags);
EXPECT_EQ(web_contents3().GetAccessibilityMode() & ~kIgnoredModeFlags,
ui::AXMode() & ~kIgnoredModeFlags);
EXPECT_EQ(accessibility_state().GetAccessibilityModeForBrowserContext(
&browser_context1()) &
~kIgnoredModeFlags,
ui::kAXModeComplete & ~kIgnoredModeFlags);
EXPECT_EQ(accessibility_state().GetAccessibilityModeForBrowserContext(
&browser_context2()) &
~kIgnoredModeFlags,
ui::AXMode() & ~kIgnoredModeFlags);
}
class AccessibilityPerformanceMeasurementExperimentSerializationOnlyResetTest
: public AccessibilityPerformanceMeasurementExperimentTest {
protected:
AccessibilityPerformanceMeasurementExperimentSerializationOnlyResetTest() =
default;
};
INSTANTIATE_TEST_SUITE_P(
RendererSerializationOnly,
AccessibilityPerformanceMeasurementExperimentSerializationOnlyResetTest,
testing::Values("RendererSerializationOnly"));
// This test verifies that accessibility is reset when leaving the Renderer
// Serialization Only experiment variant.
IN_PROC_BROWSER_TEST_P(
AccessibilityPerformanceMeasurementExperimentSerializationOnlyResetTest,
WebContentsResetAfterExperimentShutDown) {
ASSERT_TRUE(
features::IsAccessibilityPerformanceMeasurementExperimentEnabled());
ASSERT_TRUE(accessibility_state()
.IsAccessibilityPerformanceMeasurementExperimentActive());
base::RunLoop loop;
RenderAccessibilityHost::SetAccessibilityDataDiscardedCallbackForTesting(
loop.QuitClosure());
// Navigate to a page and check that the accessibility events have been
// discarded.
const std::string html = "<p>Hello World</p>";
GURL url("data:text/html," + base::EscapeQueryParamValue(html, false));
EXPECT_TRUE(NavigateToURL(shell(), url));
// This loop will quit once accessibility events arrive in the browser and
// are discarded because the "RendererSerializationOnly" variant of the
// performance experiment is active.
loop.Run();
RenderAccessibilityHost::SetAccessibilityDataDiscardedCallbackForTesting({});
// Check that events have been discarded properly. This means that a
// BrowserAccessibilityManager (BAM) was not created for this WebContents,
// as a BAM is typically instantiated when processing accessibility events.
auto* web_contents_impl = static_cast<WebContentsImpl*>(&web_contents1());
ASSERT_FALSE(web_contents_impl->GetRootBrowserAccessibilityManager());
AccessibilityNotificationWaiter waiter(&web_contents1(),
ax::mojom::Event::kLoadComplete);
// Create a new mode, which will stop the experiment.
auto scoped_mode =
accessibility_state().CreateScopedModeForProcess(ui::kAXModeBasic);
ASSERT_TRUE(waiter.WaitForNotification());
// Verify that the accessibility tree has now been loaded as a result of
// resetting accessibility on the WebContents.
ASSERT_TRUE(web_contents_impl->GetRootBrowserAccessibilityManager());
ASSERT_TRUE(web_contents_impl->GetRootBrowserAccessibilityManager()
->GetBrowserAccessibilityRoot());
}
} // namespace content
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