[cc] Track the rendering & painting cost of impl-side painting.

cc/picture_pile_impl.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 "base/debug/trace_event.h"
 #include "cc/picture_pile_impl.h"
+#include "cc/rendering_stats.h"
 #include "third_party/skia/include/core/SkCanvas.h"
+#include "third_party/skia/include/core/SkSize.h"
 
 namespace cc {
 
 scoped_refptr<PicturePileImpl> PicturePileImpl::Create() {
   return make_scoped_refptr(new PicturePileImpl());
 }
 
 PicturePileImpl::PicturePileImpl() {
 }
 
 PicturePileImpl::~PicturePileImpl() {
 }
 
 scoped_refptr<PicturePileImpl> PicturePileImpl::CloneForDrawing() const {
   TRACE_EVENT0("cc", "PicturePileImpl::CloneForDrawing");
   scoped_refptr<PicturePileImpl> clone = Create();
   clone->pile_.resize(pile_.size());
   for (size_t i = 0; i < pile_.size(); ++i)
     clone->pile_[i] = pile_[i]->Clone();
 
   return clone;
 }
 
-void PicturePileImpl::Raster(SkCanvas* canvas, gfx::Rect rect) {
+void PicturePileImpl::Raster(SkCanvas* canvas, gfx::Rect rect,
+                             RenderingStats* stats) {
+  base::TimeTicks rasterizeBeginTime = base::TimeTicks::Now();
+
   // TODO(enne): do this more efficiently, i.e. top down with Skia clips
   canvas->save();
   canvas->translate(-rect.x(), -rect.y());
   SkRect layer_skrect = SkRect::MakeXYWH(rect.x(), rect.y(),
                                          rect.width(), rect.height());
   canvas->clipRect(layer_skrect);
   for (size_t i = 0; i < pile_.size(); ++i) {
     if (!pile_[i]->LayerRect().Intersects(rect))
       continue;
     pile_[i]->Raster(canvas);
+
+    SkISize deviceSize = canvas->getDeviceSize();
+    stats->totalPixelsRasterized += deviceSize.width() * deviceSize.height();
   }
   canvas->restore();
+
+  stats->totalRasterizeTimeInSeconds += (base::TimeTicks::Now() -
+                                         rasterizeBeginTime).InSecondsF();
 }
 
 }  // namespace cc