[telemetry] Add a webdriver backend with support for IE.

tools/telemetry/telemetry/core/backends/webdriver/webdriver_tab_backend.py

+# Copyright (c) 2013 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 logging
+
+# TODO(chrisgao): Make png_bitmap sharable for both chrome and webdriver.
+from telemetry.core.chrome import png_bitmap
+
+class WebDriverTabBackend(object):
+  def __init__(self, browser_backend, window_handle):
+    self._browser_backend = browser_backend
+    self._window_handle = window_handle
+
+  def Disconnect(self):
+    pass
+
+  @property
+  def browser(self):
+    return self._browser_backend.browser
+
+  @property
+  def window_handle(self):
+    return self._window_handle
+
+  @property
+  def url(self):
+    self._browser_backend.driver.switch_to_window(self._window_handle)
+    return self._browser_backend.driver.current_url
+
+  def Activate(self):
+    # Webdriver doesn't support tab control.
+    raise NotImplementedError()
+
+  def Close(self):
+    self._browser_backend.driver.switch_to_window(self._window_handle)
+    self._browser_backend.driver.close()
+
+  def WaitForDocumentReadyStateToBeComplete(self, timeout=None):
+    # TODO(chrisgao): Double check of document state.
+    pass
+
+  def WaitForDocumentReadyStateToBeInteractiveOrBetter(self, timeout=None):
+    # TODO(chrisgao): Double check of document state.
+    pass
+
+  @property
+  def screenshot_supported(self):
+    return True
+
+  def Screenshot(self, timeout=None):  # pylint: disable=W0613
+    if timeout:
+      logging.warning('timeout is not supported')
+    self._browser_backend.driver.switch_to_window(self._window_handle)
+    snap = self._browser_backend.driver.get_screenshot_as_base64()
+    if snap:
+      return png_bitmap.PngBitmap(snap)
+    return None
+
+  @property
+  def message_output_stream(self):
+    # Webdriver has no API for grabbing console messages.
+    raise NotImplementedError()
+
+  @message_output_stream.setter
+  def message_output_stream(self, stream):
+    raise NotImplementedError()
+
+  def GetDOMStats(self, timeout=None):
+    # Webdriver has no API for DOM status.
+    raise NotImplementedError()
+
+  def PerformActionAndWaitForNavigate(self, action_function, _):
+    # TODO(chrisgao): Double check of navigation.
+    action_function()
+
+  def Navigate(self, url, script_to_evaluate_on_commit=None, timeout=None):
+    if script_to_evaluate_on_commit:
+      raise NotImplementedError('script_to_evaluate_on_commit is NOT supported')
+    self._browser_backend.driver.switch_to_window(self._window_handle)
+    if timeout:
+      self._browser_backend.driver.set_page_load_timeout(timeout * 1000)
+    self._browser_backend.driver.get(url)
+
+  def GetCookieByName(self, name, timeout=None):
+    if timeout:
+      logging.warning('timeout is not supported')
+    self._browser_backend.driver.switch_to_window(self._window_handle)
+    cookie = self._browser_backend.driver.get_cookie(name)
+    if cookie:
+      return cookie['value']
+    return None
+
+  def ExecuteJavaScript(self, expr, timeout=None):
+    self._browser_backend.driver.switch_to_window(self._window_handle)
+    if timeout:
+      logging.warning('timeout is not supported')
+    self._browser_backend.driver.execute_script(expr)
+
+  def EvaluateJavaScript(self, expr, timeout=None):
+    self._browser_backend.driver.switch_to_window(self._window_handle)
+    if timeout:
+      logging.warning('timeout is not supported')
+    return self._browser_backend.driver.execute_script(
+        'return eval(\'%s\')' % expr.replace('\'', '\\\'').replace('\n', ' '))
+
+  @property
+  def timeline_model(self):
+    # IE/Firefox has no timeline.
+    raise NotImplementedError()
+
+  def StartTimelineRecording(self):
+    raise NotImplementedError()
+
+  def StopTimelineRecording(self):
+    raise NotImplementedError()
+
+  def ClearCache(self):
+    # Can't find a way to clear cache of a tab in IE/Firefox.
+    raise NotImplementedError()