Add a very basic PIN UI implementation that is shared between lock and settings.

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

Index: chrome/browser/ui/webui/chromeos/login/oobe_ui.cc
diff --git a/chrome/browser/ui/webui/chromeos/login/oobe_ui.cc b/chrome/browser/ui/webui/chromeos/login/oobe_ui.cc
index c9b946b83e0f56c39b88fbf2fc87c243fc8124b7..a015dc622bddd9d98b164914e4d7bd17052e2ede 100644
--- a/chrome/browser/ui/webui/chromeos/login/oobe_ui.cc
+++ b/chrome/browser/ui/webui/chromeos/login/oobe_ui.cc
@@ -101,10 +101,17 @@ const char kCustomElementsHTMLPath[] = "custom_elements.html";
 const char kCustomElementsJSPath[] = "custom_elements.js";
 
 // Paths for deferred resource loading.
+const char kCustomElementsPinHTMLPath[] = "custom_elements/pin.html";
+const char kCustomElementsPinCSSPath[] = "custom_elements/pin.css";
+const char kCustomElementsPinJSPath[] = "custom_elements/pin.js";
 const char kEnrollmentHTMLPath[] = "enrollment.html";
 const char kEnrollmentCSSPath[] = "enrollment.css";
 const char kEnrollmentJSPath[] = "enrollment.js";
 
+// Shared parameter with JS that enables or disables the PIN screen. This needs
+// to stay synchronized with the JS definition.
+const char kShowPinKey[] = "showPin";
+
 // Creates a WebUIDataSource for chrome://oobe
 content::WebUIDataSource* CreateOobeUIDataSource(
     const base::DictionaryValue& localized_strings,
@@ -126,6 +133,15 @@ content::WebUIDataSource* CreateOobeUIDataSource(
     source->AddResourcePath(kCustomElementsHTMLPath,
                             IDR_CUSTOM_ELEMENTS_LOCK_HTML);
     source->AddResourcePath(kCustomElementsJSPath, IDR_CUSTOM_ELEMENTS_LOCK_JS);
+    source->AddResourcePath(kCustomElementsPinCSSPath,
+                            IDR_CUSTOM_ELEMENTS_PIN_CSS);
+    source->AddResourcePath(kCustomElementsPinHTMLPath,
+                            IDR_CUSTOM_ELEMENTS_PIN_HTML);
+    source->AddResourcePath(kCustomElementsPinJSPath,
+                            IDR_CUSTOM_ELEMENTS_PIN_JS);
+
+    // TODO(jdufault): Dynamically show pin when it is enabled.
+    source->AddBoolean(kShowPinKey, false);
   } else {
     source->SetDefaultResource(IDR_LOGIN_HTML);
     source->AddResourcePath(kLoginJSPath, IDR_LOGIN_JS);