[Presentation API, MediaRouter] Routing from media sink selection to route creation.

chrome/browser/media/router/media_router_dialog_controller.cc

 // Copyright 2015 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.
 
 #include "chrome/browser/media/router/media_router_dialog_controller.h"
 
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/browser/web_contents_delegate.h"
 
@@ skipping 97 matching lines @@
 
 void MediaRouterDialogController::ActivateInitiatorWebContents() {
   initiator_->GetDelegate()->ActivateContents(initiator_);
 }
 
 scoped_ptr<CreatePresentationSessionRequest>
 MediaRouterDialogController::PassPresentationRequest() {
   return presentation_request_.Pass();
 }
 
+std::string MediaRouterDialogController::GetMediaSourceId() const {
+  return presentation_request_->media_source().id();

[imcheng, 2015/08/18 17:50:34]

what if presentation_request_ is null?

[whywhat, 2015/08/18 19:21:24]

This is only called from CreateDialog so it should never be null.
Changed the method to more generic GetPresentationRequest and added a DCHECK in
there.

+}
+
 void MediaRouterDialogController::Reset() {
   initiator_observer_.reset();
   presentation_request_.reset();
 }
 
 }  // namespace media_router