"Redirecting URLs to Packaged Apps" implementation: revised

chrome/common/extensions/api/app_runtime.idl

 // Copyright (c) 2012 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.
 
 // Use the <code>chrome.app.runtime</code> API to manage the app lifecycle.
 // The app runtime manages app installation, controls the event page, and can
 // shut down the app at anytime.
 namespace app.runtime {
 
   [inline_doc] dictionary LaunchItem {
     // FileEntry for the file.
     [instanceOf=FileEntry] object entry;
 
     // The MIME type of the file.
     DOMString type;
   };
 
-  // Optional data for the launch.
+  // Optional data for the launch. Either <code>items</code>, or
+  // the pair (<code>url, referrerUrl</code>) can be present for any given
+  // launch.
   [inline_doc] dictionary LaunchData {
-    // The id of the file handler that the app is being invoked with.
+    // The ID of the file or URL handler that the app is being invoked with.
+    // Handler IDs are the top-level keys in the <code>file_handlers</code>
+    // and/or <code>url_handlers</code> dictionaries in the manifest.
     DOMString? id;
 
+    // The file entries for the <code>onLaunched</code> event triggered by a
+    // matching file handler in the <code>file_handlers</code> manifest key.
     LaunchItem[]? items;
+
+    // The URL for the <code>onLaunched</code> event triggered by a matching
+    // URL handler in the <code>url_handlers</code> manifest key.
+    DOMString? url;
+
+    // The referrer URL for the <code>onLaunched</code> event triggered by a
+    // matching URL handler in the <code>url_handlers</code> manifest key.
+    DOMString? referrerUrl;
   };
 
   interface Events {
     // Fired when an app is launched from the launcher.
     static void onLaunched(optional LaunchData launchData);
 
     // Fired at Chrome startup to apps that were running when Chrome last shut
     // down.
     static void onRestarted();
   };
 };