cc: Fix draw transform computation for non-drawn layers

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/layer_impl.h"
+
+namespace cc {
+
+class FakeMaskLayerImpl : public LayerImpl {
+ public:
+  static scoped_ptr<FakeMaskLayerImpl> Create(LayerTreeImpl* tree_impl, int id);
+
+  void GetContentsResourceId(ResourceId* resource_id,
+                             gfx::Size* resource_size) const override;
+
+ private:
+  FakeMaskLayerImpl(LayerTreeImpl* tree_impl, int id);
+};
+
+}  // namespace cc
+
+#endif  // CC_TEST_FAKE_MASK_LAYER_IMPL_H_