Use the solid color detection to create solid layers

cc/resources/picture_pile_base.h

Index: cc/resources/picture_pile_base.h
diff --git a/cc/resources/picture_pile_base.h b/cc/resources/picture_pile_base.h
index fb6cf5f029bdd55f8b3a01d550886c431b59d54e..1067c3ec36f88b3dd5b725d6dee53dd719b6b8ff 100644
--- a/cc/resources/picture_pile_base.h
+++ b/cc/resources/picture_pile_base.h
@@ -51,6 +51,9 @@ class CC_EXPORT PicturePileBase : public base::RefCounted<PicturePileBase> {
   // If this pile has ever contained any recordings with text.
   bool has_text() const { return has_text_; }
 
+  bool is_solid_color() const { return is_solid_color_; }
+  SkColor solid_color() const { return solid_color_; }
+
   void set_is_mask(bool is_mask) { is_mask_ = is_mask; }
   bool is_mask() const { return is_mask_; }
 
@@ -123,6 +126,8 @@ class CC_EXPORT PicturePileBase : public base::RefCounted<PicturePileBase> {
   bool has_any_recordings_;
   bool has_text_;
   bool is_mask_;
+  bool is_solid_color_;
+  SkColor solid_color_;
 
  private:
   void SetBufferPixels(int buffer_pixels);