cc: Add UMA stats for record and raster time.

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>
 
 #include "base/bind.h"
 #include "base/json/json_writer.h"
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
 #include "base/trace_event/trace_event_argument.h"
+#include "cc/base/histograms.h"
 #include "cc/debug/devtools_instrumentation.h"
 #include "cc/debug/frame_viewer_instrumentation.h"
 #include "cc/debug/traced_value.h"
 #include "cc/layers/picture_layer_impl.h"
 #include "cc/resources/raster_buffer.h"
 #include "cc/resources/tile.h"
 #include "cc/resources/tile_task_runner.h"
 #include "ui/gfx/geometry/rect_conversions.h"
 
 namespace cc {
 namespace {
 
 // Flag to indicate whether we should try and detect that
 // a tile is of solid color.
 const bool kUseColorEstimator = true;
 
+DEFINE_SCOPED_UMA_HISTOGRAM_AREA_TIMER(
+    ScopedRasterTaskTimer,
+    "Compositing.RasterTask.RasterUs",
+    "Compositing.RasterTask.RasterPixelsPerMs");
+
 class RasterTaskImpl : public RasterTask {
  public:
   RasterTaskImpl(
       const Resource* resource,
       RasterSource* raster_source,
       const gfx::Rect& content_rect,
       float contents_scale,
       TileResolution tile_resolution,
       int layer_id,
       const void* tile_id,
@@ skipping 59 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_);
+    ScopedRasterTaskTimer timer;
+    timer.SetArea(content_rect_.size().GetArea());
 
     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 846 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