Fix under-invalidation of media buffered ranges

third_party/WebKit/Source/core/html/shadow/MediaControls.h

 /*
  * Copyright (C) 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2011, 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 16 matching lines @@
 #ifndef MediaControls_h
 #define MediaControls_h
 
 #include "core/html/HTMLDivElement.h"
 #include "core/html/shadow/MediaControlElements.h"
 
 namespace blink {
 
 class Event;
 class TextTrackContainer;
+class TimeRanges;
 
 class CORE_EXPORT MediaControls final : public HTMLDivElement {
 public:
     static MediaControls* create(HTMLMediaElement&);
 
     HTMLMediaElement& mediaElement() const { return *m_mediaElement; }
 
     void reset();
 
     void show();
@@ skipping 32 matching lines @@
     // Returns the layout object for the part of the controls that should be
     // used for overlap checking during text track layout. May be null.
     LayoutObject* layoutObjectForTextTrackLayout();
 
     // Notify us that our controls enclosure has changed width.
     void notifyPanelWidthChanged(const LayoutUnit& newWidth);
 
     // Notify us that the media element's network state has changed.
     void networkStateChanged();
 
+    // Returns the cached buffered ranges for painting updated by the m_bufferedRangesPaintInvalidationTimer
+    // periodically while the media is loading. It can be null.
+    TimeRanges* bufferedRangesForPainting() const { return m_bufferedRangesForPainting.get(); }
+
     DECLARE_VIRTUAL_TRACE();
 
 private:
     void invalidate(Element*);
 
     class BatchedControlUpdate;
 
     explicit MediaControls(HTMLMediaElement&);
 
     void initializeControls();
@@ skipping 21 matching lines @@
     // Hide elements that don't fit, and show those things that we want which
     // do fit.  This requires that m_panelWidth is current.
     void computeWhichControlsFit();
 
     // Node
     bool isMediaControls() const override { return true; }
     bool willRespondToMouseMoveEvents() override { return true; }
     void defaultEventHandler(Event*) override;
     bool containsRelatedTarget(Event*);
 
+    void updateTimelinePosition();
+    void updateBufferedRanges();
+    void bufferedRangesPaintInvalidationTimerFired(TimerBase*);
+
     Member<HTMLMediaElement> m_mediaElement;
 
     // Media control elements.
     Member<MediaControlOverlayEnclosureElement> m_overlayEnclosure;
     Member<MediaControlOverlayPlayButtonElement> m_overlayPlayButton;
     Member<MediaControlCastButtonElement> m_overlayCastButton;
     Member<MediaControlPanelEnclosureElement> m_enclosure;
     Member<MediaControlPanelElement> m_panel;
     Member<MediaControlPlayButtonElement> m_playButton;
     Member<MediaControlTimelineElement> m_timeline;
     Member<MediaControlCurrentTimeDisplayElement> m_currentTimeDisplay;
     Member<MediaControlTimeRemainingDisplayElement> m_durationDisplay;
     Member<MediaControlMuteButtonElement> m_muteButton;
     Member<MediaControlVolumeSliderElement> m_volumeSlider;
     Member<MediaControlToggleClosedCaptionsButtonElement> m_toggleClosedCaptionsButton;
     Member<MediaControlTextTrackListElement> m_textTrackList;
     Member<MediaControlCastButtonElement> m_castButton;
     Member<MediaControlFullscreenButtonElement> m_fullScreenButton;
 
     Timer<MediaControls> m_hideMediaControlsTimer;
     unsigned m_hideTimerBehaviorFlags;
     bool m_isMouseOverControls : 1;
     bool m_isPausedForScrubbing : 1;
 
     Timer<MediaControls> m_panelWidthChangedTimer;
     int m_panelWidth;
 
     bool m_allowHiddenVolumeControls : 1;
+
+    Timer<MediaControls> m_bufferedRangesPaintInvalidationTimer;
+    Member<TimeRanges> m_bufferedRangesForPainting;
 };
 
 DEFINE_ELEMENT_TYPE_CASTS(MediaControls, isMediaControls());
 
 } // namespace blink
 
 #endif