Serialize PictureLayer properties.

cc/layers/empty_content_layer_client.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/layers/empty_content_layer_client.h"
+
+#include "cc/playback/display_item_list.h"
+#include "cc/playback/display_item_list_settings.h"
+#include "ui/gfx/geometry/rect.h"
+
+namespace cc {
+
+namespace {
+base::LazyInstance<EmptyContentLayerClient> g_empty_content_layer_client =
+    LAZY_INSTANCE_INITIALIZER;
+}
+
+// static
+ContentLayerClient* EmptyContentLayerClient::GetInstance() {
+  return g_empty_content_layer_client.Pointer();
+}
+
+EmptyContentLayerClient::EmptyContentLayerClient() {}
+
+EmptyContentLayerClient::~EmptyContentLayerClient() {}
+
+gfx::Rect EmptyContentLayerClient::PaintableRegion() {
+  return gfx::Rect();
+}
+
+scoped_refptr<DisplayItemList>
+EmptyContentLayerClient::PaintContentsToDisplayList(
+    PaintingControlSetting painting_status) {
+  return DisplayItemList::Create(gfx::Rect(), DisplayItemListSettings());
+}
+
+bool EmptyContentLayerClient::FillsBoundsCompletely() const {
+  return false;
+}
+
+size_t EmptyContentLayerClient::GetApproximateUnsharedMemoryUsage() const {
+  return 0U;

[vmpstr, 2015/12/16 04:21:08]

nit: 0u (lower case)

[David Trainor- moved to gerrit, 2015/12/16 19:10:58]

Done.

+}
+
+}  // namespace cc