cc: Switch RenderingStats collection in Layer::Update() to RenderingStatsInstrumentation

cc/resources/picture.cc

Index: cc/resources/picture.cc
diff --git a/cc/resources/picture.cc b/cc/resources/picture.cc
index d3ddc532c89a19e4e7dd0c4cd4f3a08000347f65..9ace4d44cf0229fb0e14693734154b2c73cc7672 100644
--- a/cc/resources/picture.cc
+++ b/cc/resources/picture.cc
@@ -3,7 +3,7 @@
 // found in the LICENSE file.
 
 #include "base/debug/trace_event.h"
-#include "cc/debug/rendering_stats.h"
+#include "cc/debug/rendering_stats_instrumentation.h"
 #include "cc/layers/content_layer_client.h"
 #include "cc/resources/picture.h"
 #include "skia/ext/analysis_canvas.h"
@@ -79,7 +79,7 @@ void Picture::CloneForDrawing(int num_threads) {
 }
 
 void Picture::Record(ContentLayerClient* painter,
-                     RenderingStats* stats,
+                     RenderingStatsInstrumentation* stats_instrumentation,
                      const SkTileGridPicture::TileGridInfo& tile_grid_info) {
   TRACE_EVENT2("cc", "Picture::Record",
                "width", layer_rect_.width(), "height", layer_rect_.height());
@@ -111,15 +111,13 @@ void Picture::Record(ContentLayerClient* painter,
   canvas->drawRect(layer_skrect, paint);
 
   gfx::RectF opaque_layer_rect;
-  base::TimeTicks begin_paint_time;
-  if (stats)
-    begin_paint_time = base::TimeTicks::Now();
+  base::TimeTicks start_time = stats_instrumentation->StartRecording();
+
   painter->PaintContents(canvas, layer_rect_, &opaque_layer_rect);
-  if (stats) {
-    stats->total_paint_time += base::TimeTicks::Now() - begin_paint_time;
-    stats->total_pixels_painted +=
-        layer_rect_.width() * layer_rect_.height();
-  }
+
+  base::TimeDelta duration = stats_instrumentation->EndRecording(start_time);
+  stats_instrumentation->AddPaint(duration,
+                                  layer_rect_.width() * layer_rect_.height());
 
   canvas->restore();
   picture_->endRecording();