[content] Fix background color update handling in RWHVAura.

content/browser/renderer_host/render_widget_host_view_android.h

 // 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.
 
 #ifndef CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_ANDROID_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_ANDROID_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 94 matching lines @@
   void UpdateCursor(const WebCursor& cursor) override;
   void SetIsLoading(bool is_loading) override;
   void FocusedNodeChanged(bool is_editable_node,
                           const gfx::Rect& node_bounds_in_screen) override;
   void RenderProcessGone(base::TerminationStatus status,
                          int error_code) override;
   void Destroy() override;
   void SetTooltipText(const base::string16& tooltip_text) override;
   bool HasAcceleratedSurface(const gfx::Size& desired_size) override;
   void SetBackgroundColor(SkColor color) override;
+  SkColor background_color() const override;
   void CopyFromCompositingSurface(
       const gfx::Rect& src_subrect,
       const gfx::Size& dst_size,
       const ReadbackRequestCallback& callback,
       const SkColorType preferred_color_type) override;
   void CopyFromCompositingSurfaceToVideoFrame(
       const gfx::Rect& src_subrect,
       const scoped_refptr<media::VideoFrame>& target,
       const base::Callback<void(const gfx::Rect&, bool)>& callback) override;
   bool CanCopyToVideoFrame() const override;
@@ skipping 199 matching lines @@
 
   // Used to customize behavior for virtual reality mode, such as the
   // appearance of overscroll glow and the keyboard.
   bool is_in_vr_;
 
   // ContentViewCoreImpl is our interface to the view system.
   ContentViewCoreImpl* content_view_core_;
 
   ImeAdapterAndroid ime_adapter_android_;
 
+  // The background color of the widget.
+  SkColor background_color_;
+
   // Body background color of the underlying document.
   SkColor cached_background_color_;
 
   mutable ui::ViewAndroid view_;
 
   // Manages the Compositor Frames received from the renderer.
   std::unique_ptr<ui::DelegatedFrameHostAndroid> delegated_frame_host_;
 
   cc::ReturnedResourceArray surface_returned_resources_;
 
@@ skipping 38 matching lines @@
   float prev_bottom_shown_pix_;
 
   base::WeakPtrFactory<RenderWidgetHostViewAndroid> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostViewAndroid);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_ANDROID_H_