Add layer bounds to compositing_dislay_item

cc/blink/web_display_item_list_impl.h

Index: cc/blink/web_display_item_list_impl.h
diff --git a/cc/blink/web_display_item_list_impl.h b/cc/blink/web_display_item_list_impl.h
index b2877046ac81168296a3f84fbc8be812424f4986..33b37e058d755ced28cb8d7e35dec7aba905cd93 100644
--- a/cc/blink/web_display_item_list_impl.h
+++ b/cc/blink/web_display_item_list_impl.h
@@ -50,9 +50,14 @@ class WebDisplayItemListImpl : public blink::WebDisplayItemList {
   virtual void appendTransparencyItem(float opacity,
                                       blink::WebBlendMode blend_mode);
   virtual void appendEndTransparencyItem();
+  // TODO(pdr): Remove this once the blink-side callers have been removed.
   virtual void appendCompositingItem(float opacity,
                                      SkXfermode::Mode,
                                      SkColorFilter*);
+  virtual void appendCompositingItem(float opacity,
+                                     SkXfermode::Mode,
+                                     SkRect* bounds,
+                                     SkColorFilter*);
   virtual void appendEndCompositingItem();
   virtual void appendFilterItem(const blink::WebFilterOperations& filters,
                                 const blink::WebFloatRect& bounds);