[Media>UI] Fix a media notification update issue when audio focus changes between tabs

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 a83e0f314b87724a7d4bf8f4b308e0871d9bb403..5cfed32bba2c70b3c9f85a0046e5c1ea9d6777d2 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
@@ -408,7 +408,8 @@ public class MediaNotificationManager {
     /**
      * Shows the notification with media controls with the specified media info. Replaces/updates
      * the current notification if already showing. Does nothing if |mediaNotificationInfo| hasn't
-     * changed from the last one.
+     * changed from the last one. If |mediaNotificationInfo.isPaused| is true and the tabId
+     * mismatches |mMediaNotificationInfo.isPaused|, it is also no-op.
      *
      * @param applicationContext context to create the notification with
      * @param notificationInfo information to show in the notification
@@ -654,6 +655,10 @@ public class MediaNotificationManager {
 
     private void showNotification(MediaNotificationInfo mediaNotificationInfo) {
         if (mediaNotificationInfo.equals(mMediaNotificationInfo)) return;
+        if (mediaNotificationInfo.isPaused && mMediaNotificationInfo != null
+                && mediaNotificationInfo.tabId != mMediaNotificationInfo.tabId) {
+            return;
+        }
 
         mMediaNotificationInfo = mediaNotificationInfo;
         mContext.startService(createIntent(mContext));