[PresentationAPI, Android] Add ChromeMediaRouter.java and bind it with the native MediaRouterAndroid

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/memory/scoped_ptr.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);
+
   // MediaRouter implementation.
   void CreateRoute(
       const MediaSource::Id& source_id,
       const MediaSink::Id& sink_id,
       const GURL& origin,
       int tab_id,
       const std::vector<MediaRouteResponseCallback>& callbacks) override;
   void JoinRoute(
       const MediaSource::Id& source,
       const std::string& presentation_id,
@@ skipping 20 matching lines @@
   void UnregisterMediaSinksObserver(MediaSinksObserver* observer) override;
   void RegisterMediaRoutesObserver(MediaRoutesObserver* observer) override;
   void UnregisterMediaRoutesObserver(MediaRoutesObserver* observer) override;
   void RegisterIssuesObserver(IssuesObserver* observer) override;
   void UnregisterIssuesObserver(IssuesObserver* observer) override;
   void RegisterPresentationSessionMessagesObserver(
       PresentationSessionMessagesObserver* observer) override;
   void UnregisterPresentationSessionMessagesObserver(
       PresentationSessionMessagesObserver* observer) override;
 
+  base::android::ScopedJavaGlobalRef<jobject> java_media_router_;
+
   DISALLOW_COPY_AND_ASSIGN(MediaRouterAndroid);
 };
 
 } // namespace media_router
 
 #endif  // CHROME_BROWSER_MEDIA_ANDROID_ROUTER_MEDIA_ROUTER_ANDROID_H_