[blimp] Add SkPicture caching support.

blimp/client/feature/compositor/blob_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_CLIENT_FEATURE_COMPOSITOR_BLOB_IMAGE_SERIALIZATION_PROCESSOR_H_
 #define BLIMP_CLIENT_FEATURE_COMPOSITOR_BLOB_IMAGE_SERIALIZATION_PROCESSOR_H_
 
 #include <memory>
 
 #include "base/macros.h"
 #include "base/memory/singleton.h"
 #include "cc/proto/image_serialization_processor.h"
 #include "third_party/skia/include/core/SkPicture.h"
 
 class SkPixelSerializer;
 
 namespace blimp {
 
 class BlobChannelReceiver;
 
 namespace client {
 
-// Adds BlobChannel image retrieval support to the Skia image decoding process.
+// Adds BlobChannel image retrieval support to the Skia image decoding process,
+// in addition to providing a cache for Skia images.
 class BlobImageSerializationProcessor : public cc::ImageSerializationProcessor {
  public:
   class ErrorDelegate {
    public:
     virtual void OnImageDecodeError() = 0;
   };
 
   // Returns the BlobImageSerializationProcessor* instance that is active
   // for the current process.
   static BlobImageSerializationProcessor* current();
 
   BlobImageSerializationProcessor();
-  virtual ~BlobImageSerializationProcessor();
+  ~BlobImageSerializationProcessor() override;
 
   // Sets the |blob_receiver| to use for reading images.
   // |blob_receiver| must outlive |this|.
   void set_blob_receiver(BlobChannelReceiver* blob_receiver) {
     blob_receiver_ = blob_receiver;
   }
 
   // |error_delegate| must outlive this.
   void set_error_delegate(ErrorDelegate* error_delegate) {
     error_delegate_ = error_delegate;
   }
 
   // Retrieves a bitmap with ID |input| from |blob_receiver_| and decodes it
   // to |bitmap|.
   bool GetAndDecodeBlob(const void* input,
                         size_t input_size,
                         SkBitmap* bitmap) const;
 
  private:
   friend struct base::DefaultSingletonTraits<BlobImageSerializationProcessor>;
 
   // Adapts a bare function pointer call to a singleton call to
   // GetAndDecodeBlob() call on the current() processor.
   static bool InstallPixelRefProc(const void* input,
                                   size_t input_size,
                                   SkBitmap* bitmap);
 
   // cc:ImageSerializationProcessor implementation.
-  SkPixelSerializer* GetPixelSerializer() override;
-  SkPicture::InstallPixelRefProc GetPixelDeserializer() override;
+  std::unique_ptr<cc::EnginePictureCache> CreateEnginePictureCache() override;
+  std::unique_ptr<cc::ClientPictureCache> CreateClientPictureCache() override;
 
   // Interface for accessing stored images received over the Blob Channel.
   BlobChannelReceiver* blob_receiver_ = nullptr;
 
   ErrorDelegate* error_delegate_ = nullptr;
 
   // Pointer is bound on object construction, and set to nullptr on object
   // deletion. Only one BlobImageSerializationProcessor may be live at a time.
   static BlobImageSerializationProcessor* current_instance_;
 
   DISALLOW_COPY_AND_ASSIGN(BlobImageSerializationProcessor);
 };
 
 }  // namespace client
 }  // namespace blimp
 
 #endif  // BLIMP_CLIENT_FEATURE_COMPOSITOR_BLOB_IMAGE_SERIALIZATION_PROCESSOR_H_