cc: Make the TileManager operate on ManagedTileState directly

cc/picture_layer_tiling_set_unittest.cc

Index: cc/picture_layer_tiling_set_unittest.cc
diff --git a/cc/picture_layer_tiling_set_unittest.cc b/cc/picture_layer_tiling_set_unittest.cc
index e3a008bc3f1e16f28d3052e35620bbc134eab4d2..b76ac8f8e8fcbb62ed5b203a00ea082092987eef 100644
--- a/cc/picture_layer_tiling_set_unittest.cc
+++ b/cc/picture_layer_tiling_set_unittest.cc
@@ -76,9 +76,9 @@ class PictureLayerTilingSetTestWithResources : public testing::Test {
       PictureLayerTiling* tiling = set.AddTiling(scale);
       std::vector<Tile*> tiles = tiling->AllTilesForTesting();
       for (size_t i = 0; i < tiles.size(); ++i) {
-        EXPECT_FALSE(tiles[i]->ManagedStateForTesting().resource);
+        EXPECT_FALSE(tiles[i]->ManagedStateForTesting()->resource);
 
-        tiles[i]->ManagedStateForTesting().resource =
+        tiles[i]->ManagedStateForTesting()->resource =
             make_scoped_ptr(new ResourcePool::Resource(
                 resource_provider.get(),
                 gfx::Size(1, 1),