cc: Trace event for veto reason

cc/resources/picture.h

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CC_RESOURCES_PICTURE_H_
 #define CC_RESOURCES_PICTURE_H_
 
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 47 matching lines @@
       bool gather_pixels_refs,
       RecordingMode recording_mode);
   static scoped_refptr<Picture> CreateFromValue(const base::Value* value);
   static scoped_refptr<Picture> CreateFromSkpValue(const base::Value* value);
 
   gfx::Rect LayerRect() const { return layer_rect_; }
 
   // Has Record() been called yet?
   bool HasRecording() const { return picture_.get() != NULL; }
 
-  bool IsSuitableForGpuRasterization() const;
+  bool IsSuitableForGpuRasterization(const char** reason) const;
   int ApproximateOpCount() const;
 
   bool HasText() const;
 
   // Apply this scale and raster the negated region into the canvas.
   // |negated_content_region| specifies the region to be clipped out of the
   // raster operation, i.e., the parts of the canvas which will not get drawn
   // to.
   int Raster(SkCanvas* canvas,
              SkDrawPictureCallback* callback,
@@ skipping 81 matching lines @@
     AsTraceableRecordData() const;
 
   friend class base::RefCountedThreadSafe<Picture>;
   friend class PixelRefIterator;
   DISALLOW_COPY_AND_ASSIGN(Picture);
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_PICTURE_H_