cc: Add support for partial swaps when using impl-side painting.

cc/resources/tile_manager_unittest.cc

Index: cc/resources/tile_manager_unittest.cc
diff --git a/cc/resources/tile_manager_unittest.cc b/cc/resources/tile_manager_unittest.cc
index fac13d64a5ae02f205c882ecbc0d64e5afed8fab..d932c72dddca1627c382d52624453794491ea701 100644
--- a/cc/resources/tile_manager_unittest.cc
+++ b/cc/resources/tile_manager_unittest.cc
@@ -82,6 +82,7 @@ class TileManagerTest : public testing::TestWithParam<bool>,
 
   // TileManagerClient implementation.
   virtual void NotifyReadyToActivate() OVERRIDE { ready_to_activate_ = true; }
+  virtual void NotifyTileInitialized(const Tile* tile) OVERRIDE {}
 
   TileVector CreateTilesWithSize(int count,
                                  TilePriority active_priority,
@@ -734,6 +735,7 @@ class TileManagerTileIteratorTest : public testing::Test,
 
   // TileManagerClient implementation.
   virtual void NotifyReadyToActivate() OVERRIDE { ready_to_activate_ = true; }
+  virtual void NotifyTileInitialized(const Tile* tile) OVERRIDE {}
 
   TileManager* tile_manager() { return host_impl_.tile_manager(); }