Pass in extra parameters to WebApkBuilder#buildWebApkAsync()

content/common/manifest_manager_messages.h

 // Copyright 2014 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.
 
 // IPC messages for the web manifest manager.
 // Multiply-included message file, hence no include guard.
 
 #include "content/common/content_export.h"
 #include "content/public/common/manifest.h"
 #include "ipc/ipc_message_macros.h"
@@ skipping 37 matching lines @@
                     int /* request_id */)
 
 // The browser process requests whether the document loaded in the associated
 // RenderFrame has a manifest link URL. The render process will respond with
 // a HasManifestResponse IPC message, along with a bool indicating the presence
 // of a manifest link, and the |request_id| that was initially given.
 IPC_MESSAGE_ROUTED1(ManifestManagerMsg_HasManifest,
                     int /* request_id */)
 
 // The render process' response to a RequestManifest. The |request_id| will
-// match the one that was initially received. The |manifest| object will be an
-// empty manifest in case of any failure.
-IPC_MESSAGE_ROUTED2(ManifestManagerHostMsg_RequestManifestResponse,
+// match the one that was initially received. The |manifest_url| and |manifest|
+// will be empty in case of any failure.
+IPC_MESSAGE_ROUTED3(ManifestManagerHostMsg_RequestManifestResponse,
                     int, /* request_id */
+                    GURL, /* manifest URL */
                     content::Manifest /* manifest */)
 
 // The render process' response to a HasManifest. The |request_id| is the one
 // sent from the browser. The |bool| will be true if the current document has a
 // manifest link URL, and false otherwise.
 IPC_MESSAGE_ROUTED2(ManifestManagerHostMsg_HasManifestResponse,
                     int, /* request_id */
                     bool /* true if the document has a manifest link */)