Use tabId as request code in media notification pending intent

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 2120f60fed0d0638dccacc4559a4f40b1bc13443..67cd06f5aa0b811c30b9dcae8cedfc81d4260f19 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
@@ -591,7 +591,8 @@ public class MediaNotificationManager {
         // The intent will currently only be null when using a custom tab.
         // TODO(avayvod) work out what we should do in this case. See https://crbug.com/585395.
         if (mMediaNotificationInfo.contentIntent != null) {
-            mNotificationBuilder.setContentIntent(PendingIntent.getActivity(mContext, 0,
+            mNotificationBuilder.setContentIntent(PendingIntent.getActivity(mContext,
+                    mMediaNotificationInfo.tabId,
                     mMediaNotificationInfo.contentIntent, 0));
         }