cc: Remove AsValue virtual from DisplayItem.

cc/playback/compositing_display_item.h

Index: cc/playback/compositing_display_item.h
diff --git a/cc/playback/compositing_display_item.h b/cc/playback/compositing_display_item.h
index d562e5ed28879e40fe90535e1d5c96aad63521c0..9555973b993f29c8d0eeb780df240b855bf4bb62 100644
--- a/cc/playback/compositing_display_item.h
+++ b/cc/playback/compositing_display_item.h
@@ -33,8 +33,6 @@ class CC_EXPORT CompositingDisplayItem : public DisplayItem {
 
   void Raster(SkCanvas* canvas,
               SkPicture::AbortCallback* callback) const override;
-  void AsValueInto(const gfx::Rect& visual_rect,
-                   base::trace_event::TracedValue* array) const override;
 
   size_t ExternalMemoryUsage() const {
     // TODO(pdr): Include color_filter's memory here.
@@ -42,6 +40,11 @@ class CC_EXPORT CompositingDisplayItem : public DisplayItem {
   }
   int ApproximateOpCount() const { return 1; }
 
+  uint8_t alpha() const { return alpha_; }
+  SkBlendMode xfermode() const { return xfermode_; }
+  bool has_bounds() const { return has_bounds_; }
+  const SkRect& bounds() const { return bounds_; }
+
  private:
   void SetNew(uint8_t alpha,
               SkBlendMode xfermode,
@@ -68,8 +71,6 @@ class CC_EXPORT EndCompositingDisplayItem : public DisplayItem {
 
   void Raster(SkCanvas* canvas,
               SkPicture::AbortCallback* callback) const override;
-  void AsValueInto(const gfx::Rect& visual_rect,
-                   base::trace_event::TracedValue* array) const override;
 
   int ApproximateOpCount() const { return 0; }
 };