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

tools/telemetry/telemetry/core/webdriver/webdriver_browser_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.
+from telemetry.core import util
+from telemetry.core.webdriver import webdriver_tab_list_backend
+
+class WebDriverBrowserBackend(object):
+  """The webdriver-based backend for controlling a locally-executed browser
+  instance, on Linux, Mac, and Windows.
+  """
+
+  WEBPAGEREPLAY_HOST = '127.0.0.1'

[tonyg, 2013/07/30 19:35:34]

Is this unused? If not, can we share it with the same constant elsewhere?

[chrisgao (Use stgao instead), 2013/07/31 19:05:41]

Found chrome backend and webdriver backend share a lot of code, including this
constant.

Added core/browser_backend.py that can be shared by backends of chrome and
webdriver.

+
+  def __init__(self, webdriver, supports_extensions, options):
+    self.browser_type = options.browser_type
+    self.webdriver_based = True
+    self._driver = webdriver
+    self._supports_extensions = supports_extensions
+    self.options = options
+    self._browser = None
+    self.webpagereplay_local_http_port = 80
+    self.webpagereplay_local_https_port = 443
+    self.webpagereplay_remote_http_port = self.webpagereplay_local_http_port
+    self.webpagereplay_remote_https_port = self.webpagereplay_local_https_port
+    self._tab_list_backend = \
+        webdriver_tab_list_backend.WebDriverTabListBackend(self)
+
+  def SetBrowser(self, browser):
+    self._browser = browser
+    self._tab_list_backend.Init()
+
+  @property
+  def driver(self):
+    return self._driver
+
+  @property
+  def browser(self):
+    return self._browser
+
+  @property
+  def is_content_shell(self):
+    return False
+
+  @property
+  def supports_extensions(self):
+    return self._supports_extensions
+
+  @property
+  def tab_list_backend(self):
+    return self._tab_list_backend
+
+  @property
+  def supports_tab_control(self):
+    # Based on webdriver protocol API, only closing a tab is supported while
+    # activating or creating a tab is not. Thus, tab control is not supported.
+    return False
+
+  @property
+  def wpr_mode(self):
+    return self.options.wpr_mode
+
+  @property
+  def supports_tracing(self):
+    # Tracing is not available in IE/Firefox yet and not supported through
+    # webdriver API.
+    return False
+
+  def StartTracing(self, _):
+    raise NotImplementedError()
+
+  def StopTracing(self):
+    raise NotImplementedError()
+
+  def GetTraceResultAndReset(self):
+    raise NotImplementedError()
+
+  def GetProcessName(self, _):
+    # Leave implementation details to subclass as process name depends on the
+    # type of browser.
+    raise NotImplementedError()
+
+  def GetRemotePort(self, _):
+    return util.GetAvailableLocalPort()
+
+  def Close(self):
+    self._driver.quit()
+    self._driver = None
+
+  def CreateForwarder(self, *port_pairs):
+    return util.DoNothingForwarder(*port_pairs)
+
+  def IsBrowserRunning(self):
+    # Assume the browser is running if not explicitly closed.
+    return self._driver is not None
+
+  def GetStandardOutput(self):
+    # TODO: Double check whether there is a way for python client to get stdout.
+    return ''
+
+  def __del__(self):
+    self.Close()