Add IPC messages for ARC notification

components/arc/common/arc_host_messages.h

 // 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.
 
 // Messages sent from the ARC instance to the host.
 // Multiply-included message file, hence no include guard.
 
 #include <string>
 #include <vector>
 
 #include "ipc/ipc_message_macros.h"
 
-#include "components/arc/common/arc_message_types.h"
+// Using relative paths since this file is shared between chromium and android.
+#include "arc_message_types.h"
+#include "arc_notification_types.h"
 
 #define IPC_MESSAGE_START ArcInstanceHostMsgStart
 
 IPC_ENUM_TRAITS_MAX_VALUE(arc::InstanceBootPhase, arc::InstanceBootPhase::LAST)
 
 IPC_MESSAGE_CONTROL1(ArcInstanceHostMsg_InstanceBootPhase,
                      arc::InstanceBootPhase)
 
 // Sends a list of available ARC apps to Chrome. Members of AppInfo must contain
 // non-empty string. This message is sent in response to
 // ArcInstanceMsg_RefreshApps message from Chrome to ARC and when ARC receives
 // boot completed notification.
 IPC_MESSAGE_CONTROL1(ArcInstanceHostMsg_AppListRefreshed,
                      std::vector<arc::AppInfo> /* apps */)
 
 // Sends an icon of required |scale_factor| for specific ARC app. The app is
 // defined by |package| and |activity|. The icon content cannot be empty and
 // must match to |scale_factor| assuming 48x48 for SCALE_FACTOR_100P.
 // |scale_factor| is an enum defined at ui/base/layout.h. This message is sent
 // in response to ArcInstanceMsg_RequestIcon from Chrome to ARC.
 IPC_MESSAGE_CONTROL4(ArcInstanceHostMsg_AppIcon,
                      std::string, /* package */
                      std::string, /* activity */
                      arc::ScaleFactor, /* scale_factor */
                      std::vector<uint8_t> /* icon_png_data */)
+
+// Tells the Chrome that a notification is posted (created or updated) on
+// Android.
+// |notification_data| is the data of notification (id, texts, icon and ...).
+IPC_MESSAGE_CONTROL1(ArcInstanceHostMsg_NotificationPosted,
+                     arc::ArcNotificationData /* notification_data */);
+
+// Notifies that a notification is removed on Android.
+// |key| is the identifier of the notification.
+IPC_MESSAGE_CONTROL1(ArcInstanceHostMsg_NotificationRemoved,
+                     std::string /* key */);