Polished UI for the host side of pairing flow.

chrome/browser/resources/chromeos/login/html-echo.js

Index: chrome/browser/resources/chromeos/login/html-echo.js
diff --git a/mojo/shell/external_service.mojom b/chrome/browser/resources/chromeos/login/html-echo.js
similarity index 73%
copy from mojo/shell/external_service.mojom
copy to chrome/browser/resources/chromeos/login/html-echo.js
index 8cc9e0cae9d2f9a8d66b1716399be1fc39f8fadc..492dd25e3ef15724f1c52fbcee17b52fff64295b 100644
--- a/mojo/shell/external_service.mojom
+++ b/chrome/browser/resources/chromeos/login/html-echo.js
@@ -2,10 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-module mojo {
-
-interface ExternalService {
-  Activate(handle<message_pipe>? service_provider_handle);
-};
-
-}
+Polymer('html-echo', {
+  contentChanged: function() {
+    this.innerHTML = this.content;
+  }
+});