Determine mask UVs based on texture size

cc/test/fake_mask_layer_impl.h

Index: cc/test/fake_mask_layer_impl.h
diff --git a/cc/test/fake_mask_layer_impl.h b/cc/test/fake_mask_layer_impl.h
index c4b646fdd57711d7556126969e3fc41ae7c79001..f7ce7f4a2c3db09f68be48f8040a4e3a9b62c476 100644
--- a/cc/test/fake_mask_layer_impl.h
+++ b/cc/test/fake_mask_layer_impl.h
@@ -19,13 +19,19 @@ class FakeMaskLayerImpl : public PictureLayerImpl {
       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