Remove devtools_instrumentation::kRasterTask in favor of frame viewer's one

cc/resources/tile_manager.cc

 // 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.
 
 #include "cc/resources/tile_manager.h"
 
 #include <algorithm>
 #include <limits>
 #include <string>
 
@@ skipping 92 matching lines @@
     UMA_HISTOGRAM_BOOLEAN("Renderer4.SolidColorTilesAnalyzed",
                           analysis_.is_solid_color);
 
     // Clear the flag if we're not using the estimator.
     analysis_.is_solid_color &= kUseColorEstimator;
   }
 
   void Raster(const RasterSource* raster_source) {
     frame_viewer_instrumentation::ScopedRasterTask raster_task(
         tile_id_, tile_resolution_, source_frame_number_, layer_id_);
-    devtools_instrumentation::ScopedLayerTask layer_task(
-        devtools_instrumentation::kRasterTask, layer_id_);
 
     DCHECK(raster_source);
 
     raster_buffer_->Playback(raster_source_.get(), content_rect_,
                              contents_scale_);
   }
 
   RasterSource::SolidColorAnalysis analysis_;
   scoped_refptr<RasterSource> raster_source_;
   gfx::Rect content_rect_;
@@ skipping 830 matching lines @@
   result -= other;
   return result;
 }
 
 bool TileManager::MemoryUsage::Exceeds(const MemoryUsage& limit) const {
   return memory_bytes_ > limit.memory_bytes_ ||
          resource_count_ > limit.resource_count_;
 }
 
 }  // namespace cc