Start caching the theme color in web_contents

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 dd59242260cbfcc48b6178936e632a80aca1c2c5..11c5a0e42b806ed4d509e83f420b0a1350102f54 100644
--- a/content/browser/renderer_host/render_widget_host_view_android.h
+++ b/content/browser/renderer_host/render_widget_host_view_android.h
@@ -139,6 +139,7 @@ class CONTENT_EXPORT RenderWidgetHostViewAndroid
   void AcceleratedSurfaceInitialized(int route_id) override;
   bool HasAcceleratedSurface(const gfx::Size& desired_size) override;
   void SetBackgroundColor(SkColor color) override;
+  void SetThemeColor(SkColor color) override;
   void CopyFromCompositingSurface(const gfx::Rect& src_subrect,
                                   const gfx::Size& dst_size,
                                   ReadbackRequestCallback& callback,
@@ -248,6 +249,8 @@ class CONTENT_EXPORT RenderWidgetHostViewAndroid
 
   bool HasValidFrame() const;
 
+  SkColor GetThemeColor() const;
+
   void MoveCaret(const gfx::Point& point);
   void DismissTextHandles();
   void SetTextHandlesTemporarilyHidden(bool hidden);
@@ -349,6 +352,9 @@ class CONTENT_EXPORT RenderWidgetHostViewAndroid
   // Body background color of the underlying document.
   SkColor cached_background_color_;
 
+  // Theme color for the underlying document.
+  SkColor cached_theme_color_;
+
   scoped_refptr<cc::DelegatedFrameResourceCollection> resource_collection_;
   scoped_refptr<cc::DelegatedFrameProvider> frame_provider_;
   scoped_refptr<cc::DelegatedRendererLayer> layer_;