Add media controls in media notification

chrome/android/java_sources.gni

 # 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.
 
 chrome_java_sources = [
   "java/src/com/google/android/apps/chrome/appwidget/bookmarks/BookmarkThumbnailWidgetProvider.java",
   "java/src/org/chromium/chrome/browser/ActivityTabTaskDescriptionHelper.java",
   "java/src/org/chromium/chrome/browser/ActivityTaskDescriptionIconGenerator.java",
   "java/src/org/chromium/chrome/browser/AfterStartupTaskUtils.java",
   "java/src/org/chromium/chrome/browser/ApplicationInitialization.java",
@@ skipping 482 matching lines @@
   "java/src/org/chromium/chrome/browser/media/router/cast/CreateRouteRequest.java",
   "java/src/org/chromium/chrome/browser/media/router/cast/DiscoveryCallback.java",
   "java/src/org/chromium/chrome/browser/media/router/cast/MediaSink.java",
   "java/src/org/chromium/chrome/browser/media/router/cast/MediaSource.java",
   "java/src/org/chromium/chrome/browser/media/ui/MediaButtonReceiver.java",
   "java/src/org/chromium/chrome/browser/media/ui/MediaImageCallback.java",
   "java/src/org/chromium/chrome/browser/media/ui/MediaImageManager.java",
   "java/src/org/chromium/chrome/browser/media/ui/MediaNotificationInfo.java",
   "java/src/org/chromium/chrome/browser/media/ui/MediaNotificationListener.java",
   "java/src/org/chromium/chrome/browser/media/ui/MediaNotificationManager.java",
+  "java/src/org/chromium/chrome/browser/media/ui/MediaSessionAction.java",
   "java/src/org/chromium/chrome/browser/media/ui/MediaSessionTabHelper.java",
   "java/src/org/chromium/chrome/browser/metrics/ActivityStopMetrics.java",
   "java/src/org/chromium/chrome/browser/metrics/LaunchMetrics.java",
   "java/src/org/chromium/chrome/browser/metrics/MediaSessionUMA.java",
   "java/src/org/chromium/chrome/browser/metrics/MediaNotificationUma.java",
   "java/src/org/chromium/chrome/browser/metrics/MemoryUma.java",
   "java/src/org/chromium/chrome/browser/metrics/PageLoadMetrics.java",
   "java/src/org/chromium/chrome/browser/metrics/StartupMetrics.java",
   "java/src/org/chromium/chrome/browser/metrics/UmaSessionStats.java",
   "java/src/org/chromium/chrome/browser/metrics/UmaUtils.java",
@@ skipping 984 matching lines @@
   "sync_shell/javatests/src/org/chromium/chrome/browser/sync/SyncTestBase.java",
   "sync_shell/javatests/src/org/chromium/chrome/browser/sync/TypedUrlsTest.java",
   "sync_shell/javatests/src/org/chromium/chrome/browser/sync/ui/PassphraseTypeDialogFragmentTest.java",
 ]
 
 # Only used for testing, should not be shipped to end users.
 if (!is_official_build) {
   chrome_java_sources += [ "java/src/org/chromium/chrome/browser/offlinepages/evaluation/OfflinePageEvaluationBridge.java" ]
   chrome_test_java_sources += [ "javatests/src/org/chromium/chrome/browser/offlinepages/OfflinePageSavePageLaterEvaluationTest.java" ]
 }