Upstream WebAPK notification related code

chrome/android/webapk/libs/runtime_library/src/org/chromium/webapk/lib/runtime_library/IWebApkApi.aidl

Index: chrome/android/webapk/libs/runtime_library/src/org/chromium/webapk/lib/runtime_library/IWebApkApi.aidl
diff --git a/chrome/android/webapk/libs/runtime_library/src/org/chromium/webapk/lib/runtime_library/IWebApkApi.aidl b/chrome/android/webapk/libs/runtime_library/src/org/chromium/webapk/lib/runtime_library/IWebApkApi.aidl
new file mode 100644
index 0000000000000000000000000000000000000000..99ab9b5548fb2b9f27614c2be74ab8f9415dc737
--- /dev/null
+++ b/chrome/android/webapk/libs/runtime_library/src/org/chromium/webapk/lib/runtime_library/IWebApkApi.aidl
@@ -0,0 +1,21 @@
+// 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.
+
+package org.chromium.webapk.lib.runtime_library;
+
+import android.app.Notification;
+
+/**
+ * Interface for communicating between WebAPK service and Chrome.
+ */
+interface IWebApkApi {
+    // Gets the id of the icon to represent WebAPK notifications in status bar.
+    int getSmallIconId();
+
+    // Display a notification.
+    void notifyNotification(String platformTag, int platformID, in Notification notification);
+
+    // Cancel a notification.
+    void cancelNotification(String platformTag, int platformID);
+}