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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/test/trace_event_analyzer.h"
#include "build/build_config.h"
#include "chrome/browser/page_load_metrics/integration_tests/metric_integration_test.h"
#include "chrome/test/base/ui_test_utils.h"
#include "components/page_load_metrics/browser/page_load_metrics_test_waiter.h"
#include "content/public/browser/back_forward_cache.h"
#include "content/public/test/browser_test.h"
#include "content/public/test/browser_test_utils.h"
#include "content/public/test/hit_test_region_observer.h"
#include "services/metrics/public/cpp/ukm_builders.h"
using ukm::builders::PageLoad;
IN_PROC_BROWSER_TEST_F(MetricIntegrationTest, FirstInputDelay) {
auto waiter = std::make_unique<page_load_metrics::PageLoadMetricsTestWaiter>(
web_contents());
waiter->AddPageExpectation(page_load_metrics::PageLoadMetricsTestWaiter::
TimingField::kFirstInputDelay);
LoadHTML(R"HTML(
<p>Sample website</p>
<script>
runtest = async () => {
const observePromise = new Promise(resolve => {
new PerformanceObserver(e => {
e.getEntries().forEach(entry => {
const fid = entry.processingStart - entry.startTime;
resolve(fid);
})
}).observe({type: 'first-input', buffered: true});
});
return await observePromise;
};
</script>
)HTML");
// Ensure that the previous page won't be stored in the back/forward cache, so
// that the histogram will be recorded when the previous page is unloaded.
// TODO(crbug.com/40189815): Investigate if this needs further fix.
web_contents()->GetController().GetBackForwardCache().DisableForTesting(
content::BackForwardCache::TEST_REQUIRES_NO_CACHING);
StartTracing({"loading"});
// We should wait for the main frame's hit-test data to be ready before
// sending the click event below to avoid flakiness.
content::WaitForHitTestData(web_contents()->GetPrimaryMainFrame());
// Ensure the compositor thread is ready for mouse events.
content::MainThreadFrameObserver frame_observer(GetRenderWidgetHost());
frame_observer.Wait();
content::SimulateMouseClick(web_contents(), 0,
blink::WebMouseEvent::Button::kLeft);
// Check web perf API.
double expected_fid = EvalJs(web_contents(), "runtest()").ExtractDouble();
EXPECT_GT(expected_fid, 0.0);
waiter->Wait();
ASSERT_TRUE(ui_test_utils::NavigateToURL(browser(), GURL("about:blank")));
// Check UKM. We compare the webexposed value to the UKM value. The webexposed
// value will be rounded whereas the UKM value will not, so it may be off by 1
// given that the comparison is at 1ms granularity. Since expected_fid is a
// double and the UKM values are int, we need leeway slightly more than 1. For
// instance expected_value could be 2.0004 and the reported value could be 1.
// So we use an epsilon of 1.2 to capture these cases.
ExpectUKMPageLoadMetricNear(PageLoad::kInteractiveTiming_FirstInputDelay4Name,
expected_fid, 1.2);
// Check UMA, which similarly may be off by one.
ExpectUniqueUMAPageLoadMetricNear(
"PageLoad.InteractiveTiming.FirstInputDelay4", expected_fid);
}
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