[uber] make the navigation controls an iframe

chrome/browser/resources/uber/uber_utils.js

Index: chrome/browser/resources/uber/uber_utils.js
diff --git a/chrome/browser/resources/uber/uber_utils.js b/chrome/browser/resources/uber/uber_utils.js
index 49d4b54fe9439dd45aa039cb034c72c8938ca977..a537454bc0f81d3641530cf27b9ce3f3c9e6dcc0 100644
--- a/chrome/browser/resources/uber/uber_utils.js
+++ b/chrome/browser/resources/uber/uber_utils.js
@@ -12,19 +12,32 @@ cr.define('uber', function() {
    * Invokes a method on the parent window (UberPage). This is a convenience
    * method for API calls into the uber page.
    * @param {String} method The name of the method to invoke.
-   * @param {Object} params Optional property bag of parameters to pass to the
-   *     invoked method.
+   * @param {Object=} opt_params Optional property bag of parameters to pass to
+   *     the invoked method.
    * @private
    */
-  function invokeMethodOnParent(method, params) {
-    if (!window.parent)
+  function invokeMethodOnParent(method, opt_params) {
+    if (window.location == window.parent.location)
       return;
 
-    var data = {method: method, params: params};
-    window.parent.postMessage(data, 'chrome://chrome');
-  };
+    invokeMethodOnWindow(window.parent, method, opt_params, 'chrome://chrome');
+  }
 
-  return {
-    invokeMethodOnParent: invokeMethodOnParent
+  /**
+   * Invokes a method on the target window.
+   * @param {String} method The name of the method to invoke.
+   * @param {Object=} opt_params Optional property bag of parameters to pass to
+   *     the invoked method.
+   * @param {String=} opt_url The origin of the target window.
+   * @private
+   */
+  function invokeMethodOnWindow(targetWindow, method, opt_params, opt_url) {
+    var data = {method: method, params: opt_params};
+    targetWindow.postMessage(data, opt_url ? opt_url : '*');
   }
+
+  return {
+    invokeMethodOnParent: invokeMethodOnParent,
+    invokeMethodOnWindow: invokeMethodOnWindow,
+  };
 });