[Cast, Android, Presentation API] Fix the logic for showing controller vs chooser dialog

chrome/browser/media/android/router/media_router_android.h

 // 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.
 
 #ifndef CHROME_BROWSER_MEDIA_ANDROID_ROUTER_MEDIA_ROUTER_ANDROID_H_
 #define CHROME_BROWSER_MEDIA_ANDROID_ROUTER_MEDIA_ROUTER_ANDROID_H_
 
 #include <jni.h>
 
 #include "base/android/scoped_java_ref.h"
 #include "base/containers/scoped_ptr_hash_map.h"
 #include "base/id_map.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/observer_list.h"
 #include "chrome/browser/media/router/media_router.h"
 
 namespace content {
 class BrowserContext;
 }
 
 namespace media_router {
 
 // A stub implementation of MediaRouter interface on Android.
 class MediaRouterAndroid : public MediaRouter {
  public:
   ~MediaRouterAndroid() override;
 
   static bool Register(JNIEnv* env);
 
+  const MediaRoute* FindRouteBySource(const MediaSource::Id& source_id) const;
+
   // MediaRouter implementation.
   void CreateRoute(
       const MediaSource::Id& source_id,
       const MediaSink::Id& sink_id,
       const GURL& origin,
       content::WebContents* web_contents,
       const std::vector<MediaRouteResponseCallback>& callbacks) override;
   void JoinRoute(
       const MediaSource::Id& source,
       const std::string& presentation_id,
@@ skipping 107 matching lines @@
       MediaRoute::Id,
       scoped_ptr<base::ObserverList<PresentationSessionMessagesObserver>>>;
   MessagesObservers messages_observers_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaRouterAndroid);
 };
 
 } // namespace media_router
 
 #endif  // CHROME_BROWSER_MEDIA_ANDROID_ROUTER_MEDIA_ROUTER_ANDROID_H_