Support buttons on ARC Notifications

components/arc/common/notifications.mojom

 // Copyright 2015 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.
 
 module arc;
 
 // These values must be matched with the NOTIFICATION_EVENT_* constants in
 // com.android.server.ArcNotificationListenerService.
 enum ArcNotificationEvent {
   BODY_CLICKED = 0,
   CLOSED = 1,
   // Five buttons at maximum (message_center::kNotificationMaximumItems = 5).
   BUTTON1_CLICKED = 2,
   BUTTON2_CLICKED = 3,
   BUTTON3_CLICKED = 4,
   BUTTON4_CLICKED = 5,
   BUTTON5_CLICKED = 6,
   MAX = BUTTON5_CLICKED
 };
 
 // These values must be matched with the NOTIFICATION_TYPE_* constants in
 // com.android.server.ArcNotificationListenerService.
 enum ArcNotificationType {
   BASIC = 0,
   IMAGE = 1,
   PROGRESS = 2,
   MAX = PROGRESS
 };
 
+struct ArcNotificationButton {
+  // Title
+  string label;
+};
+
 struct ArcNotificationData {
   // Identifier of notification
   string key;
   // Type of notification
   ArcNotificationType type;
   // Body message of notification
   string message;
   // Title of notification
   string title;
   // Mimetype of |icon_data|
   string icon_mimetype;
   // Binary data of the icon
   array<uint8> icon_data;
   // Priority of notification, must be [2,-2]
   int32 priority;
   // Timestamp related to the notification
   int64 time;
   // The current value of progress, must be [0, progress_max].
   int32 progress_current;
   // The maximum value of progress.
   int32 progress_max;
+  // Action buttons
+  array<ArcNotificationButton> buttons;
 };
 
 interface NotificationsHost {
   // Tells the Chrome that a notification is posted (created or updated) on
   // Android.
   // |notification_data| is the data of notification (id, texts, icon and ...).
   OnNotificationPosted(ArcNotificationData notification_data);
 
   // Notifies that a notification is removed on Android.
   // |key| is the identifier of the notification.
   OnNotificationRemoved(string key);
 };
 
 // TODO(lhchavez): Migrate all request/response messages to Mojo.
 interface NotificationsInstance {
   // Establishes full-duplex communication with the host.
   Init(NotificationsHost host_ptr);
 
   // Sends an event from Chrome notification UI to Android.
   // |event| is a type of occured event.
   SendNotificationEventToAndroid(string key, ArcNotificationEvent event);
 };