cc: Add traces for identification of raster buffer.

cc/raster/raster_buffer_provider.cc

 // Copyright 2013 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/raster_buffer_provider.h"
 
 #include <stddef.h>
 
 #include "base/trace_event/trace_event.h"
 #include "cc/playback/raster_source.h"
@@ skipping 35 matching lines @@
 void RasterBufferProvider::PlaybackToMemory(
     void* memory,
     ResourceFormat format,
     const gfx::Size& size,
     size_t stride,
     const RasterSource* raster_source,
     const gfx::Rect& canvas_bitmap_rect,
     const gfx::Rect& canvas_playback_rect,
     float scale,
     const RasterSource::PlaybackSettings& playback_settings) {
-  TRACE_EVENT0("cc", "RasterBufferProvider::PlaybackToMemory");
+  TRACE_EVENT0("disabled-by-default-cc.debug",
+               "RasterBufferProvider::PlaybackToMemory");
 
   DCHECK(IsSupportedPlaybackToMemoryFormat(format)) << format;
 
   // Uses kPremul_SkAlphaType since the result is not known to be opaque.
   SkImageInfo info =
       SkImageInfo::MakeN32(size.width(), size.height(), kPremul_SkAlphaType);
 
   // Use unknown pixel geometry to disable LCD text.
   SkSurfaceProps surface_props(0, kUnknown_SkPixelGeometry);
   if (raster_source->CanUseLCDText()) {
@@ skipping 76 matching lines @@
     case RGB_565:
     case RED_8:
     case LUMINANCE_F16:
       return false;
   }
   NOTREACHED();
   return false;
 }
 
 }  // namespace cc