cc: Fix draw transform computation for non-drawn layers

cc/test/fake_mask_layer_impl.cc

+// 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.
+
+#include "cc/test/fake_mask_layer_impl.h"
+
+namespace cc {
+
+FakeMaskLayerImpl::FakeMaskLayerImpl(LayerTreeImpl* tree_impl, int id)
+    : LayerImpl(tree_impl, id) {}
+
+scoped_ptr<FakeMaskLayerImpl> FakeMaskLayerImpl::Create(
+    LayerTreeImpl* tree_impl,
+    int id) {
+  return make_scoped_ptr(new FakeMaskLayerImpl(tree_impl, id));
+}
+
+void FakeMaskLayerImpl::GetContentsResourceId(ResourceId* resource_id,
+                                              gfx::Size* resource_size) const {
+  *resource_id = 0;
+}
+
+}  // namespace cc