Support for gaia login.

tools/telemetry/telemetry/core/backends/chrome/cros_browser_backend.py

Index: tools/telemetry/telemetry/core/backends/chrome/cros_browser_backend.py
diff --git a/tools/telemetry/telemetry/core/backends/chrome/cros_browser_backend.py b/tools/telemetry/telemetry/core/backends/chrome/cros_browser_backend.py
index ce7890c1a0d63a3b8a4afaca5506106aea1ccc70..5db7a5bb7bdad55f10652af2358127bca70484a3 100644
--- a/tools/telemetry/telemetry/core/backends/chrome/cros_browser_backend.py
+++ b/tools/telemetry/telemetry/core/backends/chrome/cros_browser_backend.py
@@ -215,6 +215,8 @@ class CrOSBrowserBackend(chrome_browser_backend.ChromeBrowserBackend):
         # incognito browser in a separate process, which we need to wait for.
         util.WaitFor(lambda: pid != self.pid, 10)
         self._WaitForBrowserToComeUp()
+      elif self.browser_options.gaia_login:
+        self._NavigateGaiaLogin()
       else:
         self._NavigateFakeLogin()
 
@@ -312,6 +314,20 @@ class CrOSBrowserBackend(chrome_browser_backend.ChromeBrowserBackend):
             exceptions.BrowserConnectionGoneException):
       pass
 
+  def _GaiaLoginContext(self):
+    oobe = self.oobe
+    # TODO(achuith): Implement an api in the oobe instead of calling
+    # chrome.send.
+    oobe.ExecuteJavaScript("chrome.send('addUser');")
+    for gaia_context in range(15):
+      try:
+        if oobe.EvaluateJavaScriptInContext(
+            "document.getElementById('Email') != null", gaia_context):
+          return gaia_context
+      except exceptions.EvaluateException:
+        pass
+    return None
+
   def _NavigateGuestLogin(self):
     """Navigates through oobe login screen as guest."""
     logging.info('Logging in as guest')
@@ -344,6 +360,22 @@ class CrOSBrowserBackend(chrome_browser_backend.ChromeBrowserBackend):
             % (self.browser_options.username, self.browser_options.password))
     self._WaitForLogin()
 
+  def _NavigateGaiaLogin(self):
+    """Logs into the GAIA service with provided credentials."""
+    # TODO(achuith): Fake gaia service with a python server.
+    self._WaitForSigninScreen()
+    gaia_context = util.WaitFor(self._GaiaLoginContext, timeout=10)
+    oobe = self.oobe
+    oobe.ExecuteJavaScriptInContext(
+        "document.getElementById('Email').value='%s';"
+            % self.browser_options.username, gaia_context)
+    oobe.ExecuteJavaScriptInContext(
+        "document.getElementById('Passwd').value='%s';"
+            % self.browser_options.password, gaia_context)
+    oobe.ExecuteJavaScriptInContext(
+        "document.getElementById('signIn').click();", gaia_context)
+    self._WaitForLogin()
+
   def _WaitForLogin(self):
     try:
       util.WaitFor(self._IsLoggedIn, 60)