Reland of Update media notification when page title changes

chrome/android/java/src/org/chromium/chrome/browser/media/ui/MediaNotificationManager.java

Index: chrome/android/java/src/org/chromium/chrome/browser/media/ui/MediaNotificationManager.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/media/ui/MediaNotificationManager.java b/chrome/android/java/src/org/chromium/chrome/browser/media/ui/MediaNotificationManager.java
index ad4bd08ce7a17460babf6e3c3e1a4eac71446692..90d84a2ff446879ed14ee893c6d36a637013e66c 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/media/ui/MediaNotificationManager.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/media/ui/MediaNotificationManager.java
@@ -327,6 +327,14 @@
         return getManager(notificationId) != null;
     }
 
+    @VisibleForTesting
+    @Nullable
+    protected static MediaNotificationInfo getNotificationInfoForTesting(int notificationId) {
+        MediaNotificationManager manager = getManager(notificationId);
+        if (manager == null) return null;
+        return manager.mMediaNotificationInfo;
+    }
+
     private final Context mContext;
 
     // ListenerService running for the notification. Only non-null when showing.