Use the solid color detection to create solid layers

cc/resources/picture_pile.h

Index: cc/resources/picture_pile.h
diff --git a/cc/resources/picture_pile.h b/cc/resources/picture_pile.h
index 87ea4876bdbb7660f9795efeca3ae71eb4740cf0..0e8dca68b198b7f9cdef39d3e73059818fb995fc 100644
--- a/cc/resources/picture_pile.h
+++ b/cc/resources/picture_pile.h
@@ -51,9 +51,6 @@ class CC_EXPORT PicturePile : public PicturePileBase {
     is_suitable_for_gpu_rasterization_ = false;
   }
 
-  bool IsSolidColor() const { return is_solid_color_; }
-  SkColor GetSolidColor() const { return solid_color_; }
-
  protected:
   virtual ~PicturePile();
 
@@ -63,8 +60,6 @@ class CC_EXPORT PicturePile : public PicturePileBase {
   void DetermineIfSolidColor();
 
   bool is_suitable_for_gpu_rasterization_;
-  bool is_solid_color_;
-  SkColor solid_color_;
 
   DISALLOW_COPY_AND_ASSIGN(PicturePile);
 };