[MediaRouter] The minimal change to make everything build on Android.

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 "content/public/browser/browser_thread.h"
+#include "content/public/browser/web_contents.h"
+#include "content/public/browser/web_contents_delegate.h"
+
+DEFINE_WEB_CONTENTS_USER_DATA_KEY(
+    media_router::MediaRouterDialogControllerAndroid);
+
+using content::WebContents;
+
+namespace media_router {
+
+// static
+MediaRouterDialogControllerAndroid*
+MediaRouterDialogControllerAndroid::GetOrCreateForWebContents(
+    WebContents* web_contents) {
+  DCHECK(web_contents);
+  // This call does nothing if the controller already exists.
+  MediaRouterDialogControllerAndroid::CreateForWebContents(web_contents);
+  return MediaRouterDialogControllerAndroid::FromWebContents(web_contents);
+}
+
+MediaRouterDialogControllerAndroid::MediaRouterDialogControllerAndroid(
+    WebContents* web_contents) {
+  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+}
+
+MediaRouterDialogControllerAndroid::~MediaRouterDialogControllerAndroid() {
+  DCHECK(thread_checker_.CalledOnValidThread());
+}
+
+bool MediaRouterDialogControllerAndroid::ShowMediaRouterDialogForPresentation(
+    scoped_ptr<CreatePresentationSessionRequest> request) {
+  DCHECK(thread_checker_.CalledOnValidThread());
+  return false;
+}
+
+}  // namespace media_router
+