Add Mojo IPC for seeding new Renderer with Browser's cached blob state.

blimp/engine/mojo/blob_channel_service.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_MOJO_BLOB_CHANNEL_SERVICE_H_
 #define BLIMP_ENGINE_MOJO_BLOB_CHANNEL_SERVICE_H_
 
+#include <string>
+
 #include "blimp/engine/mojo/blob_channel.mojom.h"
 #include "mojo/public/cpp/bindings/strong_binding.h"
 
 namespace blimp {
 
 class BlobChannelSender;
 
 namespace engine {
 
 // Service for processing BlobChannel requests from the renderer.
 // Runs on the browser process.
 class BlobChannelService : public mojom::BlobChannel {
  public:
   ~BlobChannelService() override;
 
   // Factory method called by Mojo.
   static void Create(BlobChannelSender* blob_channel_sender,
                      mojo::InterfaceRequest<mojom::BlobChannel> request);
 
  private:
   // Creates a BlobChannel bound to the connection specified by |request|.
   // |blob_channel_sender| must outlive the Mojo connection.
   BlobChannelService(BlobChannelSender* blob_channel_sender,
                      mojom::BlobChannelRequest request);
 
   // BlobChannel implementation.
-  void PutBlob(const mojo::String& id,
+  void GetCachedBlobIds(
+      const GetCachedBlobIdsCallback& response_callback) override;
+  void PutBlob(const std::string& id,
                mojo::ScopedSharedBufferHandle data,
                uint32_t size) override;
-  void DeliverBlob(const mojo::String& id) override;
+  void DeliverBlob(const std::string& id) override;
 
   // Binds |this| and its object lifetime to a Mojo connection.
   mojo::StrongBinding<mojom::BlobChannel> binding_;
 
   // Sender object which will receive the blobs passed over the Mojo service.
   BlobChannelSender* blob_channel_sender_;
 
   DISALLOW_COPY_AND_ASSIGN(BlobChannelService);
 };
 
 }  // namespace engine
 }  // namespace blimp
 
 #endif  // BLIMP_ENGINE_MOJO_BLOB_CHANNEL_SERVICE_H_