cc/blimp: Add (de)-serialization for PictureLayer and ScrollbarLayer.

cc/blimp/deserialized_content_layer_client.h

+// Copyright 2016 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_BLIMP_DESERIALIZED_CONTENT_LAYER_CLIENT_H_
+#define CC_BLIMP_DESERIALIZED_CONTENT_LAYER_CLIENT_H_
+
+#include "base/macros.h"
+#include "cc/layers/content_layer_client.h"
+
+namespace cc {
+
+// The ContentLayerClient used by the PictureLayers created for the remote
+// client. This holds the deserialized DisplayItemList received from the
+// corresponding PictureLayer's client on the engine.
+class DeserializedContentLayerClient : public ContentLayerClient {
+ public:
+  DeserializedContentLayerClient();
+  ~DeserializedContentLayerClient() override;
+
+  // Updates from the display list update received from the engine.
+  void UpdateDisplayListAndRecordedViewport(
+      scoped_refptr<DisplayItemList> display_list,
+      gfx::Rect recorded_viewport);
+
+  // ContentLayerClient implementation.
+  gfx::Rect PaintableRegion() override;
+  scoped_refptr<DisplayItemList> PaintContentsToDisplayList(
+      PaintingControlSetting painting_status) override;
+  bool FillsBoundsCompletely() const override;
+  size_t GetApproximateUnsharedMemoryUsage() const override;
+
+ private:
+  scoped_refptr<DisplayItemList> display_list_;
+  gfx::Rect recorded_viewport_;
+
+  DISALLOW_COPY_AND_ASSIGN(DeserializedContentLayerClient);
+};
+
+}  // namespace cc
+
+#endif  // CC_BLIMP_DESERIALIZED_CONTENT_LAYER_CLIENT_H_