Enable gaia services for enterprise autotests.

BUG=416803
TEST=manual

Review URL: https://codereview.chromium.org/593103002

Cr-Commit-Position: refs/heads/master@{#296914}

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

@@ -34,6 +34,8 @@ class CrosBrowserOptions(ChromeBrowserOptions):
     self.create_browser_with_oobe = False
     # Clear enterprise policy before logging in.
     self.clear_enterprise_policy = True
+    # Disable GAIA/enterprise services.
+    self.disable_gaia_services = True
 
     self.auto_login = True
     self.gaia_login = False

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

@@ -82,7 +82,10 @@ class CrOSBrowserBackend(chrome_browser_backend.ChromeBrowserBackend):
             # Debug logging.
             '--vmodule=*/chromeos/net/*=2,*/chromeos/login/*=2'])
 
-    if not self.browser_options.gaia_login:
+    # Disable GAIA services unless we're using GAIA login, or if there's an
+    # explicit request for it.
+    if (self.browser_options.disable_gaia_services and
+        not self.browser_options.gaia_login):
       args.append('--disable-gaia-services')
 
     return args