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

cc/layers/picture_image_layer_impl_unittest.cc

 // 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.
 
 #include "cc/layers/picture_image_layer_impl.h"
 
 #include "cc/layers/append_quads_data.h"
 #include "cc/resources/tile_priority.h"
 #include "cc/test/fake_impl_proxy.h"
 #include "cc/test/fake_layer_tree_host_impl.h"
@@ skipping 14 matching lines @@
       : PictureImageLayerImpl(tree_impl, id) {
   }
   using PictureLayerImpl::UpdateIdealScales;
   using PictureLayerImpl::MaximumTilingContentsScale;
   using PictureLayerImpl::ManageTilings;
   using PictureLayerImpl::DoPostCommitInitializationIfNeeded;
 
   void ScaleAndManageTilings(bool animating_transform_to_screen,
                              float maximum_animation_contents_scale) {
     DoPostCommitInitializationIfNeeded();
-    UpdateIdealScales();
     if (CanHaveTilings()) {
+      UpdateIdealScales();
       ManageTilings(animating_transform_to_screen,
                     maximum_animation_contents_scale);
     }
   }
   PictureLayerTilingSet* tilings() { return tilings_.get(); }
 
   friend class PictureImageLayerImplTest;
 };
 
 class PictureImageLayerImplTest : public testing::Test {
@@ skipping 117 matching lines @@
   active_layer->DidDraw(NULL);
 
   EXPECT_EQ(DrawQuad::TILED_CONTENT, quad_culler.quad_list()[0]->material);
 
   // Tiles are ready at correct scale, so should not set had_incomplete_tile.
   EXPECT_FALSE(data.had_incomplete_tile);
 }
 
 }  // namespace
 }  // namespace cc