Use the solid color detection to create solid layers

cc/layers/picture_layer_impl.h

Index: cc/layers/picture_layer_impl.h
diff --git a/cc/layers/picture_layer_impl.h b/cc/layers/picture_layer_impl.h
index 47d881dfdee8118f50177f9aa1e669a147bd32e7..57f08732059d4b49746a57863813f0a02d1bc48d 100644
--- a/cc/layers/picture_layer_impl.h
+++ b/cc/layers/picture_layer_impl.h
@@ -150,6 +150,9 @@ class CC_EXPORT PictureLayerImpl
   virtual bool HasValidTilePriorities() const;
   bool AllTilesRequiredForActivationAreReadyToDraw() const;
 
+  void SetSolidColorState(bool is_solid_color, SkColor solid_color);
+  bool IsSolidColor() const { return is_solid_color_; }
+
  protected:
   friend class LayerRasterTileIterator;
 
@@ -231,6 +234,9 @@ class CC_EXPORT PictureLayerImpl
   gfx::Rect viewport_rect_for_tile_priority_;
   gfx::Transform screen_space_transform_for_tile_priority_;
 
+  bool is_solid_color_;
+  SkColor solid_color_;
+
   friend class PictureLayer;
   DISALLOW_COPY_AND_ASSIGN(PictureLayerImpl);
 };