cc: Expand invalidation to full tile when recording is missing for the tile.

cc/resources/picture_pile_base.h

Index: cc/resources/picture_pile_base.h
diff --git a/cc/resources/picture_pile_base.h b/cc/resources/picture_pile_base.h
index dd5f883ae4bc0192e14839e8eec8c8bf5f2d83f1..6e46a1133656327b650f46842812284fe2daba76 100644
--- a/cc/resources/picture_pile_base.h
+++ b/cc/resources/picture_pile_base.h
@@ -33,6 +33,9 @@ class CC_EXPORT PicturePileBase : public base::RefCounted<PicturePileBase> {
   gfx::Rect tiling_rect() const { return tiling_.tiling_rect(); }
   void SetMinContentsScale(float min_contents_scale);
 
+  // If non-empty, all pictures tiles inside this rect are recorded.

[enne (OOO), 2014/06/17 00:02:54]

Can you also maybe say that there may be recorded tiles outside this rect (but
no non-recorded tiles inside)? I think that detail is non-obvious and maybe
could have been better commented in the first place.

[danakj, 2014/06/17 18:51:34]

Done.

+  gfx::Rect recorded_viewport() const { return recorded_viewport_; }
+
   int num_tiles_x() const { return tiling_.num_tiles_x(); }
   int num_tiles_y() const { return tiling_.num_tiles_y(); }
   gfx::Rect tile_bounds(int x, int y) const { return tiling_.TileBounds(x, y); }
@@ -98,7 +101,6 @@ class CC_EXPORT PicturePileBase : public base::RefCounted<PicturePileBase> {
   // indices to picture infos.
   PictureMap picture_map_;
   TilingData tiling_;
-  // If non-empty, all pictures tiles inside this rect are recorded.
   gfx::Rect recorded_viewport_;
   float min_contents_scale_;
   SkTileGridFactory::TileGridInfo tile_grid_info_;