Use shared memory for moving data over BlobChannel Mojo interface.

blimp/engine/renderer/blob_channel_sender_proxy.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_BLOB_CHANNEL_SENDER_PROXY_H_
 #define BLIMP_ENGINE_RENDERER_BLOB_CHANNEL_SENDER_PROXY_H_
 
 #include <memory>
 #include <string>
 
 #include "base/containers/hash_tables.h"
 #include "blimp/common/blimp_common_export.h"
 #include "blimp/engine/mojo/blob_channel.mojom.h"
 #include "blimp/net/blob_channel/blob_channel_sender.h"
 
 namespace blimp {
 namespace engine {
 
 // Class for sending blobs (e.g. images) from the renderer to the browser
 // process.
 class BLIMP_COMMON_EXPORT BlobChannelSenderProxy : public BlobChannelSender {
  public:
   BlobChannelSenderProxy();
+
   ~BlobChannelSenderProxy() override;
 
+  static std::unique_ptr<BlobChannelSenderProxy> CreateForTest(
+      mojom::BlobChannelPtr blob_channel);
+
   // Returns true if the blob is known to exist within the Engine cache.
   bool IsInEngineCache(const std::string& id) const;
 
   // Returns true if the blob has been delivered to the Client cache.
   bool IsInClientCache(const std::string& id) const;
 
   // BlobChannelSender implementation.
   void PutBlob(const BlobId& id, BlobDataPtr data) override;
   void DeliverBlob(const BlobId& id) override;
 
  private:
+  // Testing constructor, used to supply a BlobChannel Mojo proxy directly.
+  explicit BlobChannelSenderProxy(mojom::BlobChannelPtr blob_channel);
+
   // BlobChannel Mojo IPC stub, used for delivering blobs to the browser
   // process.
   mojom::BlobChannelPtr blob_channel_;
 
   // Local copy of the cache state for the local and remote BlobChannel.
   // Knowledge of the cache state enables callers to avoid unnecessary
   // image encoding and transferral if the content is already in the system.
   base::hash_map<std::string, bool> replication_state_;
 
   DISALLOW_COPY_AND_ASSIGN(BlobChannelSenderProxy);
 };
 
 }  // namespace engine
 }  // namespace blimp
 
 #endif  // BLIMP_ENGINE_RENDERER_BLOB_CHANNEL_SENDER_PROXY_H_