Port perf.py's _LoginToGoogleAccount to chrome_remote_control

tools/chrome_remote_control/chrome_remote_control/browser.py

Index: tools/chrome_remote_control/chrome_remote_control/browser.py
diff --git a/tools/chrome_remote_control/chrome_remote_control/browser.py b/tools/chrome_remote_control/chrome_remote_control/browser.py
index e90bf9eaf8ce39e060d0157e29f937751684b09f..5390a6ef38b8947b2298dc242bec7a6addaabf76 100644
--- a/tools/chrome_remote_control/chrome_remote_control/browser.py
+++ b/tools/chrome_remote_control/chrome_remote_control/browser.py
@@ -2,6 +2,7 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 from chrome_remote_control import temporary_http_server
+from chrome_remote_control import browser_credentials
 
 class Browser(object):
   """A running browser instance that can be controlled in a limited way.
@@ -16,6 +17,7 @@ class Browser(object):
   """
   def __init__(self, backend):
     self._backend = backend
+    self.credentials = browser_credentials.BrowserCredentials()
 
   def __enter__(self):
     return self
@@ -40,6 +42,13 @@ class Browser(object):
 
   def Close(self):
     self._backend.Close()
+    self.credentials = None
 
   def CreateTemporaryHTTPServer(self, path):
     return temporary_http_server.TemporaryHTTPServer(self._backend, path)
+
+  def LoginNeeded(self, credentials_type, tab):
+    self.credentials.LoginNeeded(credentials_type, tab)
+
+  def LoginNoLongerNeeded(self, credentials_type, tab):
+    self.credentials.LoginNoLongerNeeded(credentials_type, tab)