Determine mask UVs based on texture size

cc/test/fake_picture_layer.h

 // Copyright 2012 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_H_
 #define CC_TEST_FAKE_PICTURE_LAYER_H_
 
 #include <stddef.h>
 
 #include <memory>
@@ skipping 24 matching lines @@
   void reset_update_count() { update_count_ = 0; }
 
   void set_always_update_resources(bool always_update_resources) {
     always_update_resources_ = always_update_resources;
   }
 
   void set_force_unsuitable_for_gpu_rasterization(bool flag) {
     force_unsuitable_for_gpu_rasterization_ = flag;
   }
 
+  void set_fixed_tile_size(gfx::Size fixed_tile_size) {
+    fixed_tile_size_ = fixed_tile_size;
+  }
+
  private:
   explicit FakePictureLayer(ContentLayerClient* client);
   FakePictureLayer(ContentLayerClient* client,
                    std::unique_ptr<RecordingSource> source);
   ~FakePictureLayer() override;
 
   int update_count_;
   bool always_update_resources_;
 
   bool force_unsuitable_for_gpu_rasterization_;
+  gfx::Size fixed_tile_size_;
 };
 
 }  // namespace cc
 
 #endif  // CC_TEST_FAKE_PICTURE_LAYER_H_