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

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

Index: chrome/browser/media/android/router/media_router_android.cc
diff --git a/chrome/browser/media/android/router/media_router_android.cc b/chrome/browser/media/android/router/media_router_android.cc
index 9dafb489860b31fe13d74530d44d033173ac2664..6c945bb80fbfe49ef59d18822072aafa9211e016 100644
--- a/chrome/browser/media/android/router/media_router_android.cc
+++ b/chrome/browser/media/android/router/media_router_android.cc
@@ -4,16 +4,31 @@
 
 #include "chrome/browser/media/android/router/media_router_android.h"
 
+#include "base/android/jni_android.h"
 #include "base/logging.h"
+#include "jni/ChromeMediaRouter_jni.h"
 
 namespace media_router {
 
 MediaRouterAndroid::MediaRouterAndroid(content::BrowserContext*) {
+  JNIEnv* env = base::android::AttachCurrentThread();
+  java_media_router_.Reset(Java_ChromeMediaRouter_create(
+      env,
+      reinterpret_cast<jlong>(this),
+      base::android::GetApplicationContext()));
 }
 
 MediaRouterAndroid::~MediaRouterAndroid() {
 }
 
+// static
+bool MediaRouterAndroid::Register(JNIEnv* env) {
+  bool ret = RegisterNativesImpl(env);
+  // No native calls to register just yet.
+  // DCHECK(g_ChromeMediaRouter_clazz);
+  return ret;
+}
+
 void MediaRouterAndroid::CreateRoute(
     const MediaSource::Id& source_id,
     const MediaSink::Id& sink_id,