Add media controls in media notification

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

Index: chrome/android/java/src/org/chromium/chrome/browser/media/ui/MediaSessionAction.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/media/ui/MediaSessionAction.java b/chrome/android/java/src/org/chromium/chrome/browser/media/ui/MediaSessionAction.java
new file mode 100644
index 0000000000000000000000000000000000000000..cfb0bc4352db7b665c296b72154205528909a218
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/media/ui/MediaSessionAction.java
@@ -0,0 +1,18 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.chrome.browser.media.ui;
+
+/**
+ * Java counterpart to native blink::mojom::MediaSessionAction enum.
+ */
+public interface MediaSessionAction {
+    public final int ACTION_PLAY = 0;
+    public final int ACTION_PAUSE = 1;
+    public final int ACTION_PLAY_PAUSE = 2;
+    public final int ACTION_PREVIOUS_TRACK = 3;
+    public final int ACTION_NEXT_TRACK = 4;
+    public final int ACTION_SEEK_FORWARD = 5;
+    public final int ACTION_SEEK_BACKWARD = 6;
+}