cc: Ignore offscreen tiles for activation

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 11 matching lines @@
     return make_scoped_ptr(new FakePictureLayerImpl(tree_impl, id, pile));
   }
 
   virtual scoped_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl)
       OVERRIDE;
   virtual gfx::Size CalculateTileSize(gfx::Size content_bounds) OVERRIDE;
 
   using PictureLayerImpl::AddTiling;
   using PictureLayerImpl::CleanUpTilingsOnActiveLayer;
   using PictureLayerImpl::CanHaveTilings;
+  using PictureLayerImpl::MarkVisibleResourcesAsRequired;
 
   PictureLayerImpl* twin_layer() { return twin_layer_; }
   PictureLayerTilingSet* tilings() { return tilings_.get(); }
 
   const Region& invalidation() const { return invalidation_; }
   void set_invalidation(const Region& region) { invalidation_ = region; }
 
   void set_fixed_tile_size(gfx::Size size) { fixed_tile_size_ = size; }
 
  protected:
   FakePictureLayerImpl(
       LayerTreeImpl* tree_impl,
       int id,
       scoped_refptr<PicturePileImpl> pile);
   FakePictureLayerImpl(LayerTreeImpl* tree_impl, int id);
 
  private:
   gfx::Size fixed_tile_size_;
 };
 
 }  // namespace cc
 
 #endif  // CC_TEST_FAKE_PICTURE_LAYER_IMPL_H_