Implement a second version of the credentials passing API

chrome/browser/resources/gaia_auth/background.js

Index: chrome/browser/resources/gaia_auth/background.js
diff --git a/chrome/browser/resources/gaia_auth/background.js b/chrome/browser/resources/gaia_auth/background.js
index 4de43a1f956806a951d9dca868c1d7bda9c241a8..1a3f7acb726272cec75a0d1c273187d2b1747619 100644
--- a/chrome/browser/resources/gaia_auth/background.js
+++ b/chrome/browser/resources/gaia_auth/background.js
@@ -163,6 +163,8 @@ BackgroundBridge.prototype = {
     this.channelMain_.registerMessage(
         'getScrapedPasswords',
         this.onGetScrapedPasswords_.bind(this));
+    this.channelMain_.registerMessage(
+        'apiResponse', this.onAPIResponse_.bind(this));
 
     this.channelMain_.send({
       'name': 'channelConnected'
@@ -341,6 +343,14 @@ BackgroundBridge.prototype = {
     return Object.keys(passwords);
   },
 
+  /**
+   * Handler for 'apiResponse' signal sent from the main script. Passes on the
+   * |msg| to the injected script.
+   */
+  onAPIResponse_: function(msg) {
+    this.channelInjected_.send(msg);
+  },
+
   onAPICall_: function(msg) {
     this.channelMain_.send(msg);
   },