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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CONTENT_BROWSER_RENDERER_HOST_BACK_FORWARD_CACHE_DISABLE_H_
#define CONTENT_BROWSER_RENDERER_HOST_BACK_FORWARD_CACHE_DISABLE_H_
#include "content/common/content_export.h"
#include "content/public/browser/back_forward_cache.h"
#include "content/public/browser/global_routing_id.h"
namespace content {
class CONTENT_EXPORT BackForwardCacheDisable {
public:
// Reasons to disable BackForwardCache for this frame for content features.
enum class DisabledReasonId : BackForwardCache::DisabledReasonType {
// These values are persisted to logs. Entries should not be renumbered and
// numeric values should never be reused. kMaxValue is not defined because
// this enum is not logged directly as an enum (see
// BackForwardCache::DisabledSource).
kUnknown = 0,
// kMediaSessionImplOnServiceCreated = 1, Removed after implementing
// MediaSessionImplOnServiceCreated support in back/forward cache.
kSecurityHandler = 2,
kWebAuthenticationAPI = 3,
kFileChooser = 4,
kSerial = 5,
// kFileSystemAccess = 6, Removed. See https://crbug.com/1259861.
kMediaDevicesDispatcherHost = 7,
kWebBluetooth = 8,
kWebUSB = 9,
// MediaSession's playback state is changed (crbug.com/1177661).
// kMediaSession = 10 Removed after implementing support
// MediaSession's service is used (crbug.com/1243599).
kMediaSessionService = 11,
// kMediaPlay = 12, Removed after allowing media play (crbug.com/1246240).
// TODO(crbug.com/40805561): Screen readers do not recognize a navigation
// when the page is served from bfcache.
kExtendedProperties = 13,
// Documents that are cleared for discard should not be BFCached.
kDiscarded = 14,
// New reasons should be accompanied by a comment as to why BackForwardCache
// cannot be used in this case and a link to a bug to fix that if it is
// fixable.
// Any updates here should be reflected in
// tools/metrics/histograms/enums.xml
};
// Constructs a content-specific DisabledReason
static BackForwardCache::DisabledReason DisabledReason(
DisabledReasonId reason_id);
};
} // namespace content
#endif // CONTENT_BROWSER_RENDERER_HOST_BACK_FORWARD_CACHE_DISABLE_H_
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