[cc] Use base::TimeTicks in RenderStats

cc/picture.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/content_layer_client.h"
 #include "cc/picture.h"
 #include "cc/rendering_stats.h"
 #include "third_party/skia/include/core/SkCanvas.h"
 #include "third_party/skia/include/core/SkData.h"
@@ skipping 61 matching lines @@
   SkRect layer_skrect = SkRect::MakeXYWH(layer_rect_.x(),
                                          layer_rect_.y(),
                                          layer_rect_.width(),
                                          layer_rect_.height());
   canvas->clipRect(layer_skrect);
   canvas->drawRect(layer_skrect, paint);
 
   gfx::RectF opaque_layer_rect;
   base::TimeTicks beginPaintTime = base::TimeTicks::Now();
   painter->paintContents(canvas, layer_rect_, opaque_layer_rect);
-  double delta = (base::TimeTicks::Now() - beginPaintTime).InSecondsF();
-  stats.totalPaintTimeInSeconds += delta;
+  stats.totalPaintTime += base::TimeTicks::Now() - beginPaintTime;
   stats.totalPixelsPainted += layer_rect_.width() *
                               layer_rect_.height();
 
   canvas->restore();
   picture_->endRecording();
 
   opaque_rect_ = gfx::ToEnclosedRect(opaque_layer_rect);
 }
 
 void Picture::Raster(
@@ skipping 34 matching lines @@
     if (*refs && (*refs)->getURI() && !strncmp(
         (*refs)->getURI(), labelLazyDecoded, 4)) {
       result.push_back(static_cast<skia::LazyPixelRef*>(*refs));
     }
     refs++;
   }
   pixel_refs->unref();
 }
 
 }  // namespace cc