cc: Early out sooner in UpdateTilePriorities when !CanHaveTilings().

cc/test/fake_picture_layer_impl.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CC_TEST_FAKE_PICTURE_LAYER_IMPL_H_
 #define CC_TEST_FAKE_PICTURE_LAYER_IMPL_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "cc/layers/picture_layer_impl.h"
 
@@ skipping 78 matching lines @@
   void set_fixed_tile_size(const gfx::Size& size) { fixed_tile_size_ = size; }
 
   void CreateDefaultTilingsAndTiles();
   void SetAllTilesVisible();
   void SetAllTilesReady();
   void SetAllTilesReadyInTiling(PictureLayerTiling* tiling);
   void ResetAllTilesPriorities();
 
   void ScaleAndManageTilings(bool animating_transform_to_screen,
                              float maximum_animation_contents_scale) {
-    UpdateIdealScales();
     if (CanHaveTilings()) {
+      UpdateIdealScales();
       ManageTilings(animating_transform_to_screen,
                     maximum_animation_contents_scale);
     }
   }
 
  protected:
   FakePictureLayerImpl(
       LayerTreeImpl* tree_impl,
       int id,
       scoped_refptr<PicturePileImpl> pile);
   FakePictureLayerImpl(LayerTreeImpl* tree_impl,
                        int id,
                        scoped_refptr<PicturePileImpl> pile,
                        const gfx::Size& layer_bounds);
   FakePictureLayerImpl(LayerTreeImpl* tree_impl, int id);
 
  private:
   gfx::Size fixed_tile_size_;
 
   size_t append_quads_count_;
 };
 
 }  // namespace cc
 
 #endif  // CC_TEST_FAKE_PICTURE_LAYER_IMPL_H_