cc: Add UMA stats for record and raster time.

cc/resources/recording_source.h

Index: cc/resources/recording_source.h
diff --git a/cc/resources/recording_source.h b/cc/resources/recording_source.h
index ef8c0334377c1260b06c43ff8735525438b33ba1..a7bd9931ce5176855f96c1358cb8cd7efe273e0f 100644
--- a/cc/resources/recording_source.h
+++ b/cc/resources/recording_source.h
@@ -37,7 +37,8 @@ class CC_EXPORT RecordingSource {
                                            const gfx::Size& layer_size,
                                            const gfx::Rect& visible_layer_rect,
                                            int frame_number,
-                                           RecordingMode recording_mode) = 0;
+                                           RecordingMode recording_mode,
+                                           int* recorded_area) = 0;

[jbroman, 2015/04/09 17:06:54]

Unsure about parameter order. Style guide tells me all out and in-out parameters
should be at the end with Chromium style, but existing ones are at the
beginning, so I'm not sure.

 
   virtual scoped_refptr<RasterSource> CreateRasterSource(
       bool can_use_lcd_text) const = 0;