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

tools/telemetry/telemetry/core/backends/webdriver/webdriver_desktop_browser_finder.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.
+"""Finds desktop browsers that can be controlled by telemetry."""
+
+import os
+import sys
+
+from telemetry.core import browser
+from telemetry.core import util
+from telemetry.core import possible_browser
+from telemetry.core import platform
+from telemetry.core.backends.webdriver import webdriver_browser_backend
+
+
+# Add webdriver selenium client to PYTHONPATH.
+sys.path.insert(0, os.path.join(util.GetChromiumSrcDir(),
+                                'third_party', 'webdriver', 'pylib'))
+# TODO(chrisgao): Handle failure of import gracefully. crbug.com/266177
+from selenium import webdriver  # pylint: disable=F0401
+
+ALL_BROWSER_TYPES = ','.join([
+    'internet-explorer',
+    'internet-explorer-x64'])
+
+
+class PossibleWebDriverBrowser(possible_browser.PossibleBrowser):
+  """A browser that can be controlled through webdriver API."""
+
+  def __init__(self, browser_type, options):
+    super(PossibleWebDriverBrowser, self).__init__(browser_type, options)
+
+  def CreateWebDriverBackend(self):
+    raise NotImplementedError()
+
+  def Create(self):
+    backend = self.CreateWebDriverBackend()
+    b = browser.Browser(backend, platform.CreatePlatformBackendForCurrentOS())
+    return b
+
+  def SupportsOptions(self, options):
+    # TODO(chrisgao): Check if some options are not supported.
+    return True
+
+  @property
+  def last_modification_time(self):
+    return -1
+
+  def SelectDefaultBrowser(self, possible_browsers):  # pylint: disable=W0613
+    return None
+
+
+class PossibleDesktopIE(PossibleWebDriverBrowser):
+  def __init__(self, browser_type, options, architecture):
+    super(PossibleDesktopIE, self).__init__(browser_type, options)
+    self._architecture = architecture
+
+  def CreateWebDriverBackend(self):
+    def DriverCreator():
+      # TODO(chrisgao): Check in IEDriverServer.exe and specify path to it when
+      # creating the webdriver instance. crbug.com/266170
+      return webdriver.Ie()
+    return webdriver_browser_backend.WebDriverBrowserBackend(
+        DriverCreator, False, self.options)
+
+
+def FindAllAvailableBrowsers(options):
+  """Finds all the desktop browsers available on this machine."""
+  browsers = []
+
+  # Look for the IE browser in the standard location.
+  if sys.platform.startswith('win'):
+    ie_path = os.path.join('Internet Explorer', 'iexplore.exe')
+    win_search_paths = {
+        '32' : { 'path' : os.getenv('PROGRAMFILES(X86)'),
+                 'type' : 'internet-explorer'},
+        '64' : { 'path' : os.getenv('PROGRAMFILES'),
+                 'type' : 'internet-explorer-x64'}}
+    for architecture, ie_info in win_search_paths.iteritems():
+      if not ie_info['path']:
+        continue
+      if os.path.exists(os.path.join(ie_info['path'], ie_path)):
+        browsers.append(
+            PossibleDesktopIE(ie_info['type'], options, architecture))
+
+  return browsers