Inline sign in extracts gaia id from HTTP header and seeds account tracker

chrome/browser/resources/gaia_auth/main.js

Index: chrome/browser/resources/gaia_auth/main.js
diff --git a/chrome/browser/resources/gaia_auth/main.js b/chrome/browser/resources/gaia_auth/main.js
index 1c61a2448150e9d110e5aa9ae4682331e695b599..a72a291994a191311afd5db035e60503b8d837ea 100644
--- a/chrome/browser/resources/gaia_auth/main.js
+++ b/chrome/browser/resources/gaia_auth/main.js
@@ -221,8 +221,9 @@ Authenticator.prototype = {
       'usingSAML': this.isSAMLFlow_,
       'chooseWhatToSync': this.chooseWhatToSync_ || false,
       'skipForNow': opt_extraMsg && opt_extraMsg.skipForNow,
-      'sessionIndex': opt_extraMsg && opt_extraMsg.sessionIndex
-    };
+      'sessionIndex': opt_extraMsg && opt_extraMsg.sessionIndex,
+      'gaiaId': opt_extraMsg && opt_extraMsg.gaiaId
+  };
     window.parent.postMessage(msg, this.parentPage_);
     this.supportChannel_.send({name: 'resetAuth'});
   },