Move remaining Blimp feature code to core.

cc/blimp/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 CC_BLIMP_IMAGE_SERIALIZATION_PROCESSOR_H_
 #define CC_BLIMP_IMAGE_SERIALIZATION_PROCESSOR_H_
 
 #include "base/memory/ptr_util.h"
-#include "cc/blimp/client_picture_cache.h"
-#include "cc/blimp/engine_picture_cache.h"
-#include "third_party/skia/include/core/SkPicture.h"
-
-class SkPixelSerializer;
 
 namespace cc {
 
+class ClientPictureCache;
+class EnginePictureCache;
+
 // ImageSerializationProcessor provides functionality to serialize,
 // deserialize and cache Skia images.
 class ImageSerializationProcessor {
  public:
   virtual ~ImageSerializationProcessor() {}
 
   virtual std::unique_ptr<EnginePictureCache> CreateEnginePictureCache() = 0;
   virtual std::unique_ptr<ClientPictureCache> CreateClientPictureCache() = 0;
 };
 
 }  // namespace cc
 
 #endif  // CC_BLIMP_IMAGE_SERIALIZATION_PROCESSOR_H_