Determine mask UVs based on texture size

cc/test/fake_mask_layer_impl.h

 // Copyright 2015 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_MASK_LAYER_IMPL_H_
 #define CC_TEST_FAKE_MASK_LAYER_IMPL_H_
 
 #include "cc/layers/picture_layer_impl.h"
 #include "cc/raster/raster_source.h"
 
 namespace cc {
 
 class FakeMaskLayerImpl : public PictureLayerImpl {
  public:
   static std::unique_ptr<FakeMaskLayerImpl> Create(
       LayerTreeImpl* tree_impl,
       int id,
       scoped_refptr<RasterSource> raster_source,
       Layer::LayerMaskType mask_type);
 
   void GetContentsResourceId(ResourceId* resource_id,
-                             gfx::Size* resource_size) const override;
+                             gfx::Size* resource_size,
+                             gfx::SizeF* mask_uv_size) const override;
+  void set_resource_size(gfx::Size resource_size) {
+    resource_size_ = resource_size;
+  }
 
  private:
   FakeMaskLayerImpl(LayerTreeImpl* tree_impl,
                     int id,
                     scoped_refptr<RasterSource> raster_source,
                     Layer::LayerMaskType mask_type);
+
+  gfx::Size resource_size_;
 };
 
 }  // namespace cc
 
 #endif  // CC_TEST_FAKE_MASK_LAYER_IMPL_H_