cc: Add UMA stats for record and raster time.

cc/resources/display_list_recording_source.cc

Index: cc/resources/display_list_recording_source.cc
diff --git a/cc/resources/display_list_recording_source.cc b/cc/resources/display_list_recording_source.cc
index 3a47c9067ca4dc7e0634aca8269100887a91a304..fbd6142209a3fe1cf2bee1a120d75be49b6b8b25 100644
--- a/cc/resources/display_list_recording_source.cc
+++ b/cc/resources/display_list_recording_source.cc
@@ -48,7 +48,8 @@ bool DisplayListRecordingSource::UpdateAndExpandInvalidation(
     const gfx::Size& layer_size,
     const gfx::Rect& visible_layer_rect,
     int frame_number,
-    RecordingMode recording_mode) {
+    RecordingMode recording_mode,
+    int* recorded_area) {
   bool updated = false;
 
   if (size_ != layer_size) {
@@ -120,6 +121,9 @@ bool DisplayListRecordingSource::UpdateAndExpandInvalidation(
   if (gather_pixel_refs_)
     display_list_->GatherPixelRefs(grid_cell_size_);
 
+  if (recorded_area)
+    *recorded_area = recorded_viewport_.size().GetArea();
+
   return true;
 }