Pass origin to StartObservingMediaSinks.

chrome/browser/ui/webui/media_router/media_router_ui.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/ui/webui/media_router/media_router_ui.h"
 
 #include <algorithm>
 #include <string>
 #include <utility>
 
@@ skipping 252 matching lines @@
 
   query_result_manager_.reset(new QueryResultManager(router_));
   query_result_manager_->AddObserver(this);
 
   // These modes are always available.
   query_result_manager_->StartSinksQuery(MediaCastMode::DESKTOP_MIRROR,
                                          MediaSourceForDesktop());
   initiator_ = initiator;
   MediaSource mirroring_source(
       MediaSourceForTab(SessionTabHelper::IdForTab(initiator)));
+  mirroring_source.set_origin(chrome::kChromeUIMediaRouterURL);
   query_result_manager_->StartSinksQuery(MediaCastMode::TAB_MIRROR,
                                          mirroring_source);
   UpdateCastModes();
 }
 
 void MediaRouterUI::InitForTest(MediaRouter* router,
                                 content::WebContents* initiator,
                                 MediaRouterWebUIMessageHandler* handler) {
   router_ = router;
   handler_ = handler;
   InitCommon(initiator);
 }
 
 void MediaRouterUI::OnDefaultPresentationChanged(
     const PresentationRequest& presentation_request) {
   MediaSource source = presentation_request.GetMediaSource();
+  source.set_origin(GetFrameURL().spec());
   presentation_request_.reset(new PresentationRequest(presentation_request));
   query_result_manager_->StartSinksQuery(MediaCastMode::DEFAULT, source);
   // Register for MediaRoute updates.
   routes_observer_.reset(new UIMediaRoutesObserver(
       router_, source.id(),
       base::Bind(&MediaRouterUI::OnRoutesUpdated, base::Unretained(this))));
 
   UpdateCastModes();
 }
 
@@ skipping 257 matching lines @@
         base::Time::Now() - start_time_);
     start_time_ = base::Time();
   }
 }
 
 void MediaRouterUI::UpdateMaxDialogHeight(int height) {
   handler_->UpdateMaxDialogHeight(height);
 }
 
 }  // namespace media_router