Allow platform apps to add themselves to the Action Box.

chrome/common/extensions/api/page_launcher.idl

+// Copyright (c) 2013 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.
+
+namespace pageLauncher {
+  dictionary PageData {
+    // The url of the page.
+    DOMString url;
+    // The mimetype of the page.
+    DOMString mimetype;
+    // The title of the page, if it has one.
+    DOMString? page_title;
+    // The text that was selected on the page when the event fired.
+    DOMString? selected_text;
+  };
+
+  interface Events {
+    // Fired when the user clicks the page launcher entry in the action box.
+    // |pageData| : The details of the page the user was on when the button
+    // was clicked.
+    static void onClicked(PageData pageData);
+  };
+};