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

content/browser/web_contents/web_contents_android.h

Index: content/browser/web_contents/web_contents_android.h
diff --git a/content/browser/web_contents/web_contents_android.h b/content/browser/web_contents/web_contents_android.h
index 91db51d8d5c006b0fdbdfef928c3d787ef147b93..c73eec64b8c960007ee19973fa32abbccfa4beff 100644
--- a/content/browser/web_contents/web_contents_android.h
+++ b/content/browser/web_contents/web_contents_android.h
@@ -158,12 +158,13 @@ class CONTENT_EXPORT WebContentsAndroid
       const base::android::JavaParamRef<jobject>& obj,
       const base::android::JavaParamRef<jobject>& callback);
 
-  void ResumeMediaSession(JNIEnv* env,
-                          const base::android::JavaParamRef<jobject>& obj);
-  void SuspendMediaSession(JNIEnv* env,
-                           const base::android::JavaParamRef<jobject>& obj);
-  void StopMediaSession(JNIEnv* env,
-                        const base::android::JavaParamRef<jobject>& obj);
+  // Create a MediaSessionDelegateAndroid object as the native counterpart of
+  // |j_delegate| and link then together, and add it to the MediaSession of this
+  // WebContents object.
+  void AddMediaSessionDelegate(
+      JNIEnv* envm,
+      const base::android::JavaParamRef<jobject>& obj,
+      const base::android::JavaParamRef<jobject>& j_delegate);
 
   base::android::ScopedJavaLocalRef<jstring> GetEncoding(
       JNIEnv* env,