Hide fullscreen rotation jank

content/browser/renderer_host/render_widget_host_view_android.h

Index: content/browser/renderer_host/render_widget_host_view_android.h
diff --git a/content/browser/renderer_host/render_widget_host_view_android.h b/content/browser/renderer_host/render_widget_host_view_android.h
index c85662a8057446de65c9cebc13511625fa0fea0c..30003ed7419c6bf318af185125ea7e1bfb156c27 100644
--- a/content/browser/renderer_host/render_widget_host_view_android.h
+++ b/content/browser/renderer_host/render_widget_host_view_android.h
@@ -23,6 +23,7 @@
 #include "cc/scheduler/begin_frame_source.h"
 #include "components/viz/service/frame_sinks/frame_evictor.h"
 #include "content/browser/android/content_view_core_impl_observer.h"
+#include "content/browser/renderer_host/fullscreen_jank_detector.h"
 #include "content/browser/renderer_host/input/mouse_wheel_phase_handler.h"
 #include "content/browser/renderer_host/input/stylus_text_selector.h"
 #include "content/browser/renderer_host/render_widget_host_view_base.h"
@@ -161,6 +162,7 @@ class CONTENT_EXPORT RenderWidgetHostViewAndroid
   std::unique_ptr<SyntheticGestureTarget> CreateSyntheticGestureTarget()
       override;
   void OnDidNavigateMainFrameToNewPage() override;
+  void OnFullscreenStateChanged() override;
   void SetNeedsBeginFrames(bool needs_begin_frames) override;
   cc::FrameSinkId GetFrameSinkId() override;
   cc::FrameSinkId FrameSinkIdAtPoint(cc::SurfaceHittestDelegate* delegate,
@@ -238,6 +240,7 @@ class CONTENT_EXPORT RenderWidgetHostViewAndroid
   // Non-virtual methods
   void SetContentViewCore(ContentViewCoreImpl* content_view_core);
   SkColor GetCachedBackgroundColor() const;
+  void ClearThumbnailPlaceholder();
   void SendKeyEvent(const NativeWebKeyboardEvent& event);
   void SendMouseEvent(const ui::MotionEventAndroid&, int action_button);
   void SendMouseWheelEvent(const blink::WebMouseWheelEvent& event);
@@ -319,6 +322,8 @@ class CONTENT_EXPORT RenderWidgetHostViewAndroid
 
   void UpdateBackgroundColor(SkColor color);
 
+  void EvictFrameIfNecessary();
+
   // DevTools ScreenCast support for Android WebView.
   void SynchronousCopyContents(const gfx::Rect& src_subrect_in_pixel,
                                const gfx::Size& dst_size_in_pixel,
@@ -436,6 +441,9 @@ class CONTENT_EXPORT RenderWidgetHostViewAndroid
   gfx::Point prev_mousedown_point_;
   int left_click_count_ = 0;
 
+  // Identifies janky frames.
+  std::unique_ptr<FullscreenJankDetector> fullscreen_jank_detector_;
+
   cc::mojom::CompositorFrameSinkClient* renderer_compositor_frame_sink_ =
       nullptr;