Added preliminary support for tile rasterization with Ganesh

cc/resources/tile.h

Index: cc/resources/tile.h
diff --git a/cc/resources/tile.h b/cc/resources/tile.h
index fd184a6c75cac9aeca64412618b4aece2ad2a6b7..c982893ea9a4a50fef9f5c950d105b2cdd309371 100644
--- a/cc/resources/tile.h
+++ b/cc/resources/tile.h
@@ -111,6 +111,7 @@ class CC_EXPORT Tile : public RefCountedManaged<Tile> {
   friend class PrioritizedTileSet;
   friend class FakeTileManager;
   friend class BinComparator;
+  friend class GaneshRasterizer;

[reveman, 2013/11/24 21:56:57]

is this necessary?

[slavi, 2013/11/25 23:13:14]

Yes, I need access to part tile's state that's not exposed currently. I can
expose it publicly but it seems that's not what we want since all other friend
classes don't need to be friends any more.

 
   // Methods called by by tile manager.
   Tile(TileManager* tile_manager,