Incorporate BlobChannel into Blimp image encode/decode pipeline.

blimp/engine/app/blimp_browser_main_parts.cc

Index: blimp/engine/app/blimp_browser_main_parts.cc
diff --git a/blimp/engine/app/blimp_browser_main_parts.cc b/blimp/engine/app/blimp_browser_main_parts.cc
index 7ce6201d9113b02e76664905975cbf4e7268c36f..d1a95ecc0d3ecf3e83a9a69b31216c52174299eb 100644
--- a/blimp/engine/app/blimp_browser_main_parts.cc
+++ b/blimp/engine/app/blimp_browser_main_parts.cc
@@ -60,6 +60,10 @@ SettingsManager* BlimpBrowserMainParts::GetSettingsManager() {
   return settings_manager_.get();
 }
 
+BlobChannelSender* BlimpBrowserMainParts::GetBlobChannelSender() {
+  return engine_session_->blob_channel_sender();
+}
+
 BlimpEngineSession* BlimpBrowserMainParts::GetBlimpEngineSession() {
   return engine_session_.get();
 }