[Smart Lock] Add a private API to show an error bubble anchored to the Smart Lock app window.

chrome/browser/ui/proximity_auth/proximity_auth_error_bubble.cc

Index: chrome/browser/ui/proximity_auth/proximity_auth_error_bubble.cc
diff --git a/chrome/browser/ui/proximity_auth/proximity_auth_error_bubble.cc b/chrome/browser/ui/proximity_auth/proximity_auth_error_bubble.cc
new file mode 100644
index 0000000000000000000000000000000000000000..8636fc71f7cd597a0dd42d428f4007f6bd28d3c0
--- /dev/null
+++ b/chrome/browser/ui/proximity_auth/proximity_auth_error_bubble.cc
@@ -0,0 +1,19 @@
+// 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.
+
+#include "chrome/browser/ui/proximity_auth/proximity_auth_error_bubble.h"
+
+#include "base/logging.h"
+
+#if !defined(TOOLKIT_VIEWS)
+// static
+void ProxmityAuthErrorBubble::ShowErrorBubble(
+    const base::string16& message,
+    const gfx::Range& link_range,
+    const GURL& link_url,
+    const gfx::Rect& anchor_rect,
+    content::WebContents* web_contents) {
+  NOTIMPLEMENTED();
+}
+#endif