cc: Do not cleanup tiles with raster tasks.

cc/test/fake_tile_manager.cc

Index: cc/test/fake_tile_manager.cc
diff --git a/cc/test/fake_tile_manager.cc b/cc/test/fake_tile_manager.cc
index 1fc2e43e7f861a902be572e7745f1807cd44528d..b051389bfacd820fe974eccd8dbc1fb67d453347 100644
--- a/cc/test/fake_tile_manager.cc
+++ b/cc/test/fake_tile_manager.cc
@@ -99,7 +99,13 @@ void FakeTileManager::DidFinishRunningTasksForTesting() {
 }
 
 void FakeTileManager::Release(Tile* tile) {
+  // TODO(sohanjg): Find which tree the tile exists, and reset
+  // priority for it.
+  tile->SetPriority(ACTIVE_TREE, TilePriority());
+  tile->SetPriority(PENDING_TREE, TilePriority());
   TileManager::Release(tile);
+
+  FreeResourcesForReleasedTiles();
   CleanUpReleasedTiles();
 }