Port perf.py's _LoginToGoogleAccount to chrome_remote_control

tools/chrome_remote_control/chrome_remote_control/credentials_backend.py

Index: tools/chrome_remote_control/chrome_remote_control/credentials_backend.py
diff --git a/tools/chrome_remote_control/chrome_remote_control/credentials_backend.py b/tools/chrome_remote_control/chrome_remote_control/credentials_backend.py
new file mode 100644
index 0000000000000000000000000000000000000000..c4dac87875161daddd105f98bcde20a09a0dfc15
--- /dev/null
+++ b/tools/chrome_remote_control/chrome_remote_control/credentials_backend.py
@@ -0,0 +1,83 @@
+# Copyright (c) 2012 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import chrome_remote_control.util as util
+import json
+import os
+import logging
+
+class CredentialsBackend(object):
+  label = None
+  _config_file = os.path.join(os.path.dirname(__file__), '..', '..', 'gpu',
+                              'page_sets', 'credentials.json')
+  _config = None
+
+  def __init__(self):
+    pass
+
+  def LoginNeeded(self, tab):
+    raise NotImplementedError()
+
+  def LoginNoLongerNeeded(self, tab):
+    raise NotImplementedError()
+
+  @classmethod
+  def _ReadConfigFile(cls):
+    try:
+      with open(cls._config_file, 'r') as f:
+        contents = f.read()
+        return json.loads(contents)
+    except SyntaxError, e:
+      logging.info('Could not read %s: %s', cls._config_file,
+                   str(e))
+
+  @classmethod
+  def GetConfig(cls, config):
+    if cls._config is None:
+      cls._config = cls._ReadConfigFile()
+
+    for key in cls._config:
+      if cls._config.get(key) is not None and key in config:
+        config[key] = cls._config.get(key)
+
+    return config
+
+  @classmethod
+  def ResetConfig(cls):
+    cls._config = None
+
+  @staticmethod
+  def SubmitForm(form_id, tab):
+    """Submits the given form ID, and returns after it has been submitted.
+
+    Args:
+      form_id: the id attribute of the form to submit.
+    """
+    js = 'document.getElementById("%s").submit();' % form_id
+
+    tab.runtime.Execute(js)
+
+  @staticmethod
+  def WaitForFormToLoad(form_id, tab):
+    def IsFormLoaded():
+      return tab.runtime.Evaluate(
+          'document.querySelector("#%s")!== null' % form_id)
+
+    # Wait until the form is submitted and the page completes loading.
+    util.WaitFor(lambda: IsFormLoaded(), 60) # pylint: disable=W0108
+
+  @classmethod
+  def SubmitFormAndWait(cls, form_id, tab):
+    cls.SubmitForm(form_id, tab)
+
+    def IsLoginStillHappening():
+      return tab.runtime.Evaluate(
+          'document.querySelector("#%s")!== null' % form_id)
+
+    # Wait until the form is submitted and the page completes loading.
+    util.WaitFor(lambda: not IsLoginStillHappening(), 60)
+
+  @classmethod
+  def SetCredentialsConfigFile(cls, credentials_path):
+    cls._config_file = credentials_path