chrome/blink: Add functionality for in-product help for media elements.

third_party/WebKit/Source/modules/media_controls/BUILD.gn

 # Copyright 2017 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.
 
 import("//third_party/WebKit/Source/modules/modules.gni")
 import("//tools/grit/grit_rule.gni")
 
 blink_modules_sources("media_controls") {
   sources = [
     "MediaControlsImpl.cpp",
     "MediaControlsImpl.h",
     "MediaControlsMediaEventListener.cpp",
     "MediaControlsMediaEventListener.h",
     "MediaControlsOrientationLockDelegate.cpp",
     "MediaControlsOrientationLockDelegate.h",
     "MediaControlsRotateToFullscreenDelegate.cpp",
     "MediaControlsRotateToFullscreenDelegate.h",
     "MediaControlsWindowEventListener.cpp",
     "MediaControlsWindowEventListener.h",
+    "MediaDownloadInProductHelpManager.cpp",
+    "MediaDownloadInProductHelpManager.h",
     "elements/MediaControlCastButtonElement.cpp",
     "elements/MediaControlCastButtonElement.h",
     "elements/MediaControlCurrentTimeDisplayElement.cpp",
     "elements/MediaControlCurrentTimeDisplayElement.h",
     "elements/MediaControlDivElement.cpp",
     "elements/MediaControlDivElement.h",
     "elements/MediaControlDownloadButtonElement.cpp",
     "elements/MediaControlDownloadButtonElement.h",
     "elements/MediaControlElementBase.cpp",
     "elements/MediaControlElementBase.h",
@@ skipping 45 matching lines @@
 
 grit("media_controls_resources") {
   output_dir = "$blink_modules_output_dir/media_controls/resources/"
   source = "resources/media_controls_resources.grd"
   outputs = [
     "grit/media_controls_resources.h",
     "media_controls_resources_100_percent.pak",
     "media_controls_resources_200_percent.pak",
   ]
 }