Hide fullscreen rotation jank

content/browser/renderer_host/render_widget_host_view_android.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/renderer_host/render_widget_host_view_android.h"
 
 #include <android/bitmap.h>
 
 #include <utility>
 
@@ skipping 1119 matching lines @@
 void RenderWidgetHostViewAndroid::DidCreateNewRendererCompositorFrameSink() {
   delegated_frame_host_->CompositorFrameSinkChanged();
   // Accumulated resources belong to the old RendererCompositorFrameSink and
   // should not be returned.
   surface_returned_resources_.clear();
 }
 
 void RenderWidgetHostViewAndroid::SubmitCompositorFrame(
     const cc::LocalSurfaceId& local_surface_id,
     cc::CompositorFrame frame) {
+  // In fullscreen, prevent background from flashing white.

[Khushal, 2017/04/12 01:56:55]

Like we were discussing this will still miss a few cases.

1) This call only happens when you get a new frame. So till the time there is no
update from the renderer, you won't see any change.

2) For the transition into video, you'll still see the stale frame. Except the
area not drawn will be black.

May be the better thing to do is to draw black instead of the stale frame when
we go fullscreen in the browser, until we wait for the renderer's corresponding
frame.

+  if (content_view_core_ &&
+      content_view_core_->GetWebContents()->IsFullscreen()) {
+    frame.metadata.root_background_color = SK_ColorBLACK;
+  }
+
   last_scroll_offset_ = frame.metadata.root_scroll_offset;
   DCHECK(delegated_frame_host_);
   DCHECK(!frame.render_pass_list.empty());
 
   cc::RenderPass* root_pass = frame.render_pass_list.back().get();
   current_surface_size_ = root_pass->output_rect.size();
   bool is_transparent = root_pass->has_transparent_background;
 
   cc::CompositorFrameMetadata metadata = frame.metadata.Clone();
 
@@ skipping 1023 matching lines @@
 
   ui::WindowAndroidCompositor* compositor = window_android->GetCompositor();
   if (!compositor)
     return;
 
   overscroll_controller_ = base::MakeUnique<OverscrollControllerAndroid>(
       overscroll_refresh_handler, compositor, view_.GetDipScale());
 }
 
 }  // namespace content