BlobChannelService is modified to be Mojo Service.

blimp/engine/session/blimp_engine_session.h

Index: blimp/engine/session/blimp_engine_session.h
diff --git a/blimp/engine/session/blimp_engine_session.h b/blimp/engine/session/blimp_engine_session.h
index c95e02e9823634f8bdad0fc9974b5bf91ca11dc6..187b820faf08dc09161fad47d5e945842648083d 100644
--- a/blimp/engine/session/blimp_engine_session.h
+++ b/blimp/engine/session/blimp_engine_session.h
@@ -15,6 +15,7 @@
 #include "blimp/engine/feature/engine_render_widget_feature.h"
 #include "blimp/engine/feature/engine_settings_feature.h"
 #include "blimp/engine/feature/geolocation/engine_geolocation_feature.h"
+#include "blimp/engine/mojo/blob_channel_service.h"
 #include "blimp/net/blimp_message_processor.h"
 #include "blimp/net/connection_error_observer.h"
 #include "content/public/browser/invalidate_type.h"
@@ -96,6 +97,10 @@ class BlimpEngineSession
     return blob_channel_sender_.get();
   }
 
+  BlobChannelService* blob_channel_service() {
+    return blob_channel_service_.get();
+  }
+
   // Gets Engine's listening port. Invokes callback with the allocated port.
   void GetEnginePortForTesting(const GetPortCallback& callback);
 
@@ -201,10 +206,14 @@ class BlimpEngineSession
   // Sends outgoing blob data as BlimpMessages.
   HeliumBlobSenderDelegate* blob_delegate_;
 
-  // Receives image data from the renderer and sends it to the client via
+  // Receives image data and sends it to the client via
   // |blob_delegate_|.
   std::unique_ptr<BlobChannelSender> blob_channel_sender_;
 
+  // Receives image data from the renderer and sends it to
+  // |blob_channel_sender_|.
+  std::unique_ptr<BlobChannelService> blob_channel_service_;
+
   // Handles all incoming and outgoing messages related to Geolocation.
   EngineGeolocationFeature geolocation_feature_;