[cros] check for updates in WebUI OOBE can be cancelled in dev builds.

chrome/browser/ui/webui/chromeos/login/update_screen_handler.cc

Index: chrome/browser/ui/webui/chromeos/login/update_screen_handler.cc
diff --git a/chrome/browser/ui/webui/chromeos/login/update_screen_handler.cc b/chrome/browser/ui/webui/chromeos/login/update_screen_handler.cc
index 7d0a53a9d29a25f3c6e64a83bde3c52b86e3fb39..4027fd0e12599946a5ad97e6ee1cb247fe54e08c 100644
--- a/chrome/browser/ui/webui/chromeos/login/update_screen_handler.cc
+++ b/chrome/browser/ui/webui/chromeos/login/update_screen_handler.cc
@@ -33,6 +33,12 @@ void UpdateScreenHandler::GetLocalizedStrings(
       l10n_util::GetStringUTF16(IDS_CHECKING_FOR_UPDATES));
   localized_strings->SetString("installingUpdateDesc",
       l10n_util::GetStringUTF16(IDS_INSTALLING_UPDATE_DESC));
+#if !defined(OFFICIAL_BUILD)
+  localized_strings->SetString("cancelUpdateHint",
+      l10n_util::GetStringUTF16(IDS_UPDATE_CANCEL));
+  localized_strings->SetString("cancelledUpdateMessage",
+      l10n_util::GetStringUTF16(IDS_UPDATE_CANCELLED));
+#endif
 }
 
 void UpdateScreenHandler::Initialize() {
@@ -42,12 +48,19 @@ void UpdateScreenHandler::Initialize() {
   }
 }
 
+void UpdateScreenHandler::SetDelegate(UpdateScreenActor::Delegate* screen) {
+  screen_ = screen;
+}
+
 void UpdateScreenHandler::Show() {
   if (!page_is_ready()) {
     show_on_init_ = true;
     return;
   }
   ShowScreen(kUpdateScreen, NULL);
+#if !defined(OFFICIAL_BUILD)
+  web_ui_->CallJavascriptFunction("oobe.UpdateScreen.enableUpdateCancel");
+#endif
 }
 
 void UpdateScreenHandler::Hide() {
@@ -87,6 +100,18 @@ void UpdateScreenHandler::ShowPreparingUpdatesInfo(bool visible) {
 }
 
 void UpdateScreenHandler::RegisterMessages() {
+#if !defined(OFFICIAL_BUILD)
+  web_ui_->RegisterMessageCallback(
+      "cancelUpdate",
+      NewCallback(this, &UpdateScreenHandler::HandleUpdateCancel));
+#endif
+}
+
+#if !defined(OFFICIAL_BUILD)
+void UpdateScreenHandler::HandleUpdateCancel(const base::ListValue* args) {
+  DCHECK(args && args->empty());
+  screen_->CancelUpdate();
 }
+#endif
 
 }  // namespace chromeos