cc: Add traces for identification of raster buffer.

cc/raster/gpu_raster_buffer_provider.cc

 // Copyright 2014 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.
 
 #include "cc/raster/gpu_raster_buffer_provider.h"
 
 #include <stdint.h>
 
 #include <algorithm>
 
@@ skipping 26 matching lines @@
   }
 
   // Overridden from RasterBuffer:
   void Playback(
       const RasterSource* raster_source,
       const gfx::Rect& raster_full_rect,
       const gfx::Rect& raster_dirty_rect,
       uint64_t new_content_id,
       float scale,
       const RasterSource::PlaybackSettings& playback_settings) override {
-    TRACE_EVENT0("cc", "RasterBufferImpl::Playback");
+    TRACE_EVENT0("cc", "GpuRasterBuffer::Playback");
     // GPU raster doesn't do low res tiles, so should always include images.
     DCHECK(!playback_settings.skip_images);
 
     ContextProvider::ScopedContextLock scoped_context(
         rasterizer_->worker_context_provider());
 
     gfx::Rect playback_rect = raster_full_rect;
     if (resource_has_previous_content_) {
       playback_rect.Intersect(raster_dirty_rect);
     }
@@ skipping 68 matching lines @@
 
 bool GpuRasterBufferProvider::GetResourceRequiresSwizzle(
     bool must_support_alpha) const {
   // This doesn't require a swizzle because we rasterize to the correct format.
   return false;
 }
 
 void GpuRasterBufferProvider::Shutdown() {}
 
 }  // namespace cc