[Android,Cast] Report correctly when devices are not available.

chrome/browser/media/android/router/media_router_dialog_controller_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_dialog_controller_android.h"
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_string.h"
 #include "chrome/browser/media/android/router/media_router_android.h"
 #include "chrome/browser/media/router/media_router.h"
@@ skipping 69 matching lines @@
 
   CancelPresentationRequest();
 }
 
 void MediaRouterDialogControllerAndroid::OnDialogCancelled(
     JNIEnv* env,
     const JavaParamRef<jobject>& obj) {
   CancelPresentationRequest();
 }
 
+void MediaRouterDialogControllerAndroid::OnMediaSourceNotSupported(
+    JNIEnv* env,
+    const JavaParamRef<jobject>& obj) {
+  std::unique_ptr<CreatePresentationConnectionRequest> request =
+      TakeCreateConnectionRequest();
+  if (!request)
+    return;
+
+  request->InvokeErrorCallback(content::PresentationError(
+      content::PRESENTATION_ERROR_NO_AVAILABLE_SCREENS, "No screens found."));
+}
+
 void MediaRouterDialogControllerAndroid::CancelPresentationRequest() {
   std::unique_ptr<CreatePresentationConnectionRequest> request =
       TakeCreateConnectionRequest();
   if (!request)
     return;
 
   request->InvokeErrorCallback(content::PresentationError(
       content::PRESENTATION_ERROR_PRESENTATION_REQUEST_CANCELLED,
       "Dialog closed."));
 }
@@ skipping 56 matching lines @@
 }
 
 bool MediaRouterDialogControllerAndroid::IsShowingMediaRouterDialog() const {
   JNIEnv* env = base::android::AttachCurrentThread();
   return Java_ChromeMediaRouterDialogController_isShowingDialog(
       env, java_dialog_controller_);
 }
 
 }  // namespace media_router