cc: Changed total_pixels_rasterized to be a return value

cc/resources/tile_manager.cc

Index: cc/resources/tile_manager.cc
diff --git a/cc/resources/tile_manager.cc b/cc/resources/tile_manager.cc
index 10f9179032c1ddc420a91516ed4c4dbec8690889..65c2e9e11bd3ad46f555e4d4521b0c0a64f50b2a 100644
--- a/cc/resources/tile_manager.cc
+++ b/cc/resources/tile_manager.cc
@@ -984,9 +984,8 @@ void TileManager::RunRasterTask(
 
   base::TimeTicks start_time = stats_instrumentation->StartRecording();
 
-  int64 total_pixels_rasterized = 0;
-  picture_pile->Raster(&canvas, rect, contents_scale,
-                       &total_pixels_rasterized);
+  int64 total_pixels_rasterized =
+      picture_pile->Raster(&canvas, rect, contents_scale);
 
   base::TimeDelta duration = stats_instrumentation->EndRecording(start_time);