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

chrome/browser/media/android/router/media_router_android.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/android/router/media_router_android.h"
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_array.h"
 #include "base/android/jni_string.h"
 #include "base/guid.h"
@@ skipping 36 matching lines @@
 MediaRouterAndroid::~MediaRouterAndroid() {
 }
 
 // static
 bool MediaRouterAndroid::Register(JNIEnv* env) {
   bool ret = RegisterNativesImpl(env);
   DCHECK(g_ChromeMediaRouter_clazz);
   return ret;
 }
 
+const MediaRoute* MediaRouterAndroid::FindRouteBySource(
+    const MediaSource::Id& source_id) const {
+  for (const auto& route : active_routes_) {
+    if (route.media_source().id() == source_id)
+      return &route;
+  }
+  return nullptr;
+}
+
 void MediaRouterAndroid::CreateRoute(
     const MediaSource::Id& source_id,
     const MediaSink::Id& sink_id,
     const GURL& origin,
     content::WebContents* web_contents,
     const std::vector<MediaRouteResponseCallback>& callbacks) {
   if (!origin.is_valid()) {
     for (const MediaRouteResponseCallback& callback : callbacks)
       callback.Run(nullptr, "", "Invalid origin");
     return;
@@ skipping 360 matching lines @@
   scoped_ptr<content::PresentationSessionMessage> message(
       new content::PresentationSessionMessage(content::TEXT));
   message->message = ConvertJavaStringToUTF8(env, jmessage);
   session_messages.push_back(message.Pass());
 
   FOR_EACH_OBSERVER(PresentationSessionMessagesObserver, *observer_list,
                     OnMessagesReceived(session_messages, true));
 }
 
 }  // namespace media_router