Link MediaSessionTabHelper with native MediaSession [CL is going to be split]

content/browser/web_contents/web_contents_android.cc

Index: content/browser/web_contents/web_contents_android.cc
diff --git a/content/browser/web_contents/web_contents_android.cc b/content/browser/web_contents/web_contents_android.cc
index 054aaffdaf89e1223c51cbe97b0bc4d8f44091b4..d2b2e987d41c6e0399dc8ea35cd94656f8114b26 100644
--- a/content/browser/web_contents/web_contents_android.cc
+++ b/content/browser/web_contents/web_contents_android.cc
@@ -21,6 +21,8 @@
 #include "content/browser/frame_host/interstitial_page_impl.h"
 #include "content/browser/media/android/browser_media_player_manager.h"
 #include "content/browser/media/android/media_web_contents_observer_android.h"
+#include "content/browser/media/session/media_session.h"
+#include "content/browser/media/session/media_session_delegate_android.h"
 #include "content/browser/renderer_host/render_view_host_impl.h"
 #include "content/browser/web_contents/web_contents_impl.h"
 #include "content/common/devtools_messages.h"
@@ -613,19 +615,12 @@ void WebContentsAndroid::RequestAccessibilitySnapshot(
       snapshot_callback);
 }
 
-void WebContentsAndroid::ResumeMediaSession(JNIEnv* env,
-                                            const JavaParamRef<jobject>& obj) {
-  web_contents_->ResumeMediaSession();
-}
-
-void WebContentsAndroid::SuspendMediaSession(JNIEnv* env,
-                                             const JavaParamRef<jobject>& obj) {
-  web_contents_->SuspendMediaSession();
-}
-
-void WebContentsAndroid::StopMediaSession(JNIEnv* env,
-                                          const JavaParamRef<jobject>& obj) {
-  web_contents_->StopMediaSession();
+void WebContentsAndroid::AddMediaSessionDelegate(

[whywhat, 2016/10/21 18:28:15]

When is the delegate going to be removed?
Do you think we could create the delegate in advance in WCA? Does it have to be
on demand?

+    JNIEnv* env,
+    const JavaParamRef<jobject>& obj,
+    const JavaParamRef<jobject>& j_delegate) {
+  MediaSessionDelegateAndroid::CreateAndConnect(
+      MediaSession::Get(web_contents()), env, j_delegate);
 }
 
 ScopedJavaLocalRef<jstring> WebContentsAndroid::GetEncoding(