WebUI: Allow rejecting a promise that is returned from cr.sendWithPromise().

chrome/browser/ui/webui/settings/md_settings_ui.cc

 // 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.
 
 #include "chrome/browser/ui/webui/settings/md_settings_ui.h"
 
 #include <stddef.h>
 
 #include <string>
 
@@ skipping 26 matching lines @@
 #endif  // defined(OS_CHROMEOS)
 
 namespace settings {
 
 SettingsPageUIHandler::SettingsPageUIHandler() {
 }
 
 SettingsPageUIHandler::~SettingsPageUIHandler() {
 }
 
 void SettingsPageUIHandler::CallJavascriptCallback(

[Dan Beam, 2016/03/03 19:04:51]

maybe we could just introduce 2 methods, ResolveCallback() and RejectCallback()?

[dpapad, 2016/03/03 19:51:53]

Done.

-    const base::Value& callback_id, const base::Value& response) {
+    const base::Value& callback_id,
+    bool is_success,
+    const base::Value& response) {
   // cr.webUIResponse is a global JS function exposed from cr.js.
-  web_ui()->CallJavascriptFunction("cr.webUIResponse", callback_id, response);
+  web_ui()->CallJavascriptFunction(
+      "cr.webUIResponse", callback_id,
+      base::FundamentalValue(is_success), response);
 }
 
 MdSettingsUI::MdSettingsUI(content::WebUI* web_ui)
     : content::WebUIController(web_ui),
       WebContentsObserver(web_ui->GetWebContents()) {
   Profile* profile = Profile::FromWebUI(web_ui);
   AddSettingsPageUIHandler(new AppearanceHandler(web_ui));
   AddSettingsPageUIHandler(new ClearBrowsingDataHandler(web_ui));
   AddSettingsPageUIHandler(new DownloadsHandler());
   AddSettingsPageUIHandler(new FontHandler(web_ui));
@@ skipping 60 matching lines @@
   UMA_HISTOGRAM_TIMES("Settings.LoadDocumentTime.MD",
                       base::Time::Now() - load_start_time_);
 }
 
 void MdSettingsUI::DocumentOnLoadCompletedInMainFrame() {
   UMA_HISTOGRAM_TIMES("Settings.LoadCompletedTime.MD",
                       base::Time::Now() - load_start_time_);
 }
 
 }  // namespace settings