Add NotificationOptions.actions so websites can provide buttons (blink)

public/BUILD.gn

 # Copyright 2014 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("//tools/grit/grit_rule.gni")
 
 if (is_android) {
   import("//build/config/android/rules.gni")
 }
 
@@ skipping 239 matching lines @@
     "platform/modules/screen_orientation/WebScreenOrientationType.h",
     "platform/modules/screen_orientation/WebLockOrientationCallback.h",
     "platform/modules/screen_orientation/WebScreenOrientationLockType.h",
     "platform/modules/screen_orientation/WebLockOrientationError.h",
     "platform/modules/vr/WebVR.h",
     "platform/modules/vr/WebVRClient.h",
     "platform/modules/notifications/WebNotificationPermission.h",
     "platform/modules/notifications/WebNotificationDelegate.h",
     "platform/modules/notifications/WebNotificationManager.h",
     "platform/modules/notifications/WebNotificationData.h",
+    "platform/modules/notifications/WebNotificationAction.h",
     "platform/modules/push_messaging/WebPushSubscription.h",
     "platform/modules/push_messaging/WebPushPermissionStatus.h",
     "platform/modules/push_messaging/WebPushClient.h",
     "platform/modules/push_messaging/WebPushSubscriptionOptions.h",
     "platform/modules/push_messaging/WebPushError.h",
     "platform/modules/push_messaging/WebPushProvider.h",
     "platform/linux/WebFontInfo.h",
     "platform/linux/WebFallbackFont.h",
     "platform/linux/WebSandboxSupport.h",
     "platform/linux/WebFontRenderStyle.h",
@@ skipping 376 matching lines @@
 grit("image_resources") {
   output_dir = "$root_gen_dir/blink/public/resources"
   use_qualified_include = true
   source = "blink_image_resources.grd"
   outputs = [
     "grit/blink_image_resources.h",
     "blink_image_resources_100_percent.pak",
     "blink_image_resources_200_percent.pak",
   ]
 }