[blimp] Add SkPicture caching support.

blimp/engine/renderer/engine_image_serialization_processor.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 BLIMP_ENGINE_RENDERER_ENGINE_IMAGE_SERIALIZATION_PROCESSOR_H_
 #define BLIMP_ENGINE_RENDERER_ENGINE_IMAGE_SERIALIZATION_PROCESSOR_H_
 
 #include <memory>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "blimp/common/blimp_common_export.h"
 #include "blimp/common/blob_cache/id_util.h"
 #include "blimp/engine/mojo/blob_channel.mojom.h"
 #include "cc/proto/image_serialization_processor.h"
+#include "cc/proto/picture_cache.h"
 #include "third_party/libwebp/webp/encode.h"
-#include "third_party/skia/include/core/SkPicture.h"
 #include "third_party/skia/include/core/SkPixelSerializer.h"
 
 namespace content {
 class RenderFrame;
 }  // class content
 
 namespace blimp {
 namespace engine {
 
 class BlobChannelSenderProxy;
 
-// EngineImageSerializationProcessor provides functionality to serialize and
-// deserialize Skia images.
+// EngineImageSerializationProcessor provides functionality to serialize
+// and temporarily cache Skia images.
 class BLIMP_COMMON_EXPORT EngineImageSerializationProcessor
     : public cc::ImageSerializationProcessor,
       public SkPixelSerializer {
  public:
   explicit EngineImageSerializationProcessor(
       std::unique_ptr<BlobChannelSenderProxy> blob_channel);
   ~EngineImageSerializationProcessor() override;
 
   // cc::ImageSerializationProcessor implementation.
-  SkPixelSerializer* GetPixelSerializer() override;
-  SkPicture::InstallPixelRefProc GetPixelDeserializer() override;
+  std::unique_ptr<cc::EnginePictureCache> CreateEnginePictureCache() override;
+  std::unique_ptr<cc::ClientPictureCache> CreateClientPictureCache() override;
 
   // SkPixelSerializer implementation.
   bool onUseEncodedData(const void* data, size_t len) override;
   SkData* onEncode(const SkPixmap& pixmap) override;
 
  private:
   scoped_refptr<BlobData> EncodeImageAsBlob(const SkPixmap& pixmap);
 
+  // A serializer that be used to pass in to SkPicture::serialize(...) for
+  // serializing the SkPicture to a stream.
   std::unique_ptr<SkPixelSerializer> pixel_serializer_;
 
   // Sends image data as blobs to the browser process.
   std::unique_ptr<BlobChannelSenderProxy> blob_channel_;
 
   // Reusable output buffer for image encoding.
   WebPMemoryWriter writer_state_;
 
   DISALLOW_COPY_AND_ASSIGN(EngineImageSerializationProcessor);
 };
 
 }  // namespace engine
 }  // namespace blimp
 
 #endif  // BLIMP_ENGINE_RENDERER_ENGINE_IMAGE_SERIALIZATION_PROCESSOR_H_