cc: Partial tile update for one-copy raster.

cc/playback/picture_pile_impl.h

Index: cc/playback/picture_pile_impl.h
diff --git a/cc/playback/picture_pile_impl.h b/cc/playback/picture_pile_impl.h
index f7e17386db51de37b07955c4970a26067f3468cc..0e1164b2dff8241b8b0d95e89abcdbd4ea953e00 100644
--- a/cc/playback/picture_pile_impl.h
+++ b/cc/playback/picture_pile_impl.h
@@ -39,7 +39,8 @@ class CC_EXPORT PicturePileImpl : public RasterSource {
   // reported rasterize time (in stats_instrumentation) is the minimum measured
   // value over all runs.
   void PlaybackToCanvas(SkCanvas* canvas,
-                        const gfx::Rect& canvas_rect,
+                        const gfx::Rect& canvas_bitmap_rect,
+                        const gfx::Rect& canvas_playback_rect,

[reveman, 2015/05/22 17:15:13]

nit: is the canvas always backed by a bitmap? maybe canvas_rect and
playback_rect if not

[danakj, 2015/05/26 19:02:52]

It is. For gpu raster the bitmap is backed by a texture, but it's always an
SkBitmap (ie we're rastering here not recording).

[reveman, 2015/05/26 20:12:37]

Ok, makes sense then.

                         float contents_scale) const override;
   void PlaybackToSharedCanvas(SkCanvas* canvas,
                               const gfx::Rect& canvas_rect,