MD Settings: About page, add an explicit 'aboutPageReady' signal.

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

 // 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.
 
 #include "chrome/browser/ui/webui/settings/about_handler.h"
 
 #include <stddef.h>
 
 #include <string>
 
@@ skipping 293 matching lines @@
   html_source->AddString("aboutUserAgent", GetUserAgent());
   html_source->AddString("aboutJsEngineVersion", v8::V8::GetVersion());
   html_source->AddString("aboutBlinkVersion", content::GetWebKitVersion());
 #endif
 
   return new AboutHandler();
 }
 
 void AboutHandler::RegisterMessages() {
   web_ui()->RegisterMessageCallback(
+      "aboutPageReady",
+      base::Bind(&AboutHandler::HandlePageReady, base::Unretained(this)));
+  web_ui()->RegisterMessageCallback(
       "refreshUpdateStatus",
       base::Bind(&AboutHandler::HandleRefreshUpdateStatus,
                  base::Unretained(this)));
   web_ui()->RegisterMessageCallback(
       "relaunchNow",
       base::Bind(&AboutHandler::HandleRelaunchNow, base::Unretained(this)));
   web_ui()->RegisterMessageCallback(
       "openFeedbackDialog", base::Bind(&AboutHandler::HandleOpenFeedbackDialog,
                                        base::Unretained(this)));
   web_ui()->RegisterMessageCallback(
@@ skipping 93 matching lines @@
   bool current_auto_update_disabled = false;
   if (current_policy)
     CHECK(current_policy->GetAsBoolean(&current_auto_update_disabled));
 
   if (current_auto_update_disabled != previous_auto_update_disabled) {
     // Refresh the update status to refresh the status of the UI.
     RefreshUpdateStatus();
   }
 }
 
+void AboutHandler::HandlePageReady(const base::ListValue* args) {
+  AllowJavascript();
+}
+
 void AboutHandler::HandleRefreshUpdateStatus(const base::ListValue* args) {
-  AllowJavascript();
   RefreshUpdateStatus();
 }
 
 void AboutHandler::RefreshUpdateStatus() {
 // On Chrome OS, do not check for an update automatically.
 #if defined(OS_CHROMEOS)
   static_cast<VersionUpdaterCros*>(version_updater_.get())
       ->GetUpdateStatus(
           base::Bind(&AboutHandler::SetUpdateStatus, base::Unretained(this)));
 #else
@@ skipping 202 matching lines @@
   std::string url = std::string("chrome://") + chrome::kChromeOSAssetHost +
                     "/" + path.MaybeAsASCII();
   regulatory_info->SetString("url", url);
 
   ResolveJavascriptCallback(base::StringValue(callback_id), *regulatory_info);
 }
 
 #endif  // defined(OS_CHROMEOS)
 
 }  // namespace settings