[blimp] Add SkPicture caching support.

blimp/engine/renderer/engine_image_serialization_processor.h

Index: blimp/engine/renderer/engine_image_serialization_processor.h
diff --git a/blimp/engine/renderer/engine_image_serialization_processor.h b/blimp/engine/renderer/engine_image_serialization_processor.h
index d400704b15f52da6187b841a42a9fe9adf5a8b65..db245e0fc28d70e64364b0ce6f404e2b4f6a57c8 100644
--- a/blimp/engine/renderer/engine_image_serialization_processor.h
+++ b/blimp/engine/renderer/engine_image_serialization_processor.h
@@ -11,7 +11,7 @@
 #include "blimp/common/blimp_common_export.h"
 #include "blimp/engine/mojo/blob_channel.mojom.h"
 #include "cc/proto/image_serialization_processor.h"
-#include "third_party/skia/include/core/SkPicture.h"
+#include "cc/proto/picture_cache.h"
 
 class SkPixelSerializer;
 
@@ -22,8 +22,8 @@ class RenderFrame;
 namespace blimp {
 namespace engine {
 
-// 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:
@@ -32,11 +32,14 @@ class BLIMP_COMMON_EXPORT EngineImageSerializationProcessor
   ~EngineImageSerializationProcessor();
 
   // cc::ImageSerializationProcessor implementation.
-  SkPixelSerializer* GetPixelSerializer() override;
-  SkPicture::InstallPixelRefProc GetPixelDeserializer() override;
+  std::unique_ptr<cc::EnginePictureCache> CreateEnginePictureCache() override;
+  std::unique_ptr<cc::ClientPictureCache> CreateClientPictureCache() override;
 
  private:
+  // A serializer that be used to pass in to SkPicture::serialize(...) for
+  // serializing the SkPicture to a stream.
   std::unique_ptr<SkPixelSerializer> pixel_serializer_;
+
   mojom::BlobChannelPtr blob_channel_;
 
   DISALLOW_COPY_AND_ASSIGN(EngineImageSerializationProcessor);