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..db3b4fa007dc17e3087568faa12f862118b69518
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/media/ui/MediaSessionAction.java
@@ -0,0 +1,45 @@
+// 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;
+
+/**
+ * MediaSession action kind enum corresponding to blink::mojom::MediaSessionAction.
+ */
+public enum MediaSessionAction {
+    ACTION_PLAY(0),
+    ACTION_PAUSE(1),
+    ACTION_PLAY_PAUSE(2),
+    ACTION_PREVIOUS_TRACK(3),
+    ACTION_NEXT_TRACK(4),
+    ACTION_SEEK_FORWARD(5),
+    ACTION_SEEK_BACKWARD(6);
+
+    private final int mValue;
+
+    /**
+     * Converts an int to its equivalent MediaSessionAction.
+     * @param i The integer to convert.
+     * @return The enum that |i| corresponds to.
+     */
+    public static MediaSessionAction fromInt(int i) {
+        for (MediaSessionAction type : MediaSessionAction.values()) {
+            if (type.getValue() == i) {
+                return type;
+            }
+        }
+        return null;
+    }
+
+    /**
+     * @return The integer the enum corresponds to.
+     */
+    public int getValue() {
+        return mValue;
+    }
+
+    private MediaSessionAction(int value) {
+        mValue = value;
+    }
+}