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

tools/telemetry/telemetry/core/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 possible_browser
+from telemetry.core.platform import win_platform_backend
+from telemetry.core.webdriver import webdriver_browser_backend
+
+
+# Add webdriver selenium client to PYTHONPATH.
+sys.path.insert(0, os.path.join(os.path.dirname(__file__),
+                                '..', '..', '..', '..', '..', 'third_party',

[tonyg, 2013/07/26 18:21:07]

util.GetChromiumSrcDir()

[chrisgao (Use stgao instead), 2013/07/30 02:06:49]

Thx, this makes it easier and cleaner.

+                                'webdriver', 'pylib'))
+from selenium import webdriver  # pylint: disable=F0401
+
+ALL_BROWSER_TYPES = ','.join([
+    'webdriver.ie32',

[tonyg, 2013/07/26 18:21:07]

Since these are user-facing names, can we call them "internetexplorer" and
"internetexplorer_x64" (for consistency with desktop_browser_finder.py).

[chrisgao (Use stgao instead), 2013/07/30 02:06:49]

Done.

+    'webdriver.ie64'])
+
+
+class PossibleIEDesktopBrowser(possible_browser.PossibleBrowser):

[tonyg, 2013/07/26 18:21:07]

Should this really be called PossibleIE or just PossibleWebDriver? I'm wondering
whether Firefox would use the same class.

[chrisgao (Use stgao instead), 2013/07/30 02:06:49]

I don't think firefox can share the same class, as the ways to create a
webdriver instance are different.
But we can create a shared class PossibleWebDriver and make subclass for IE and
firefox.

+  """A desktop browser that can be controlled."""
+
+  def __init__(self, browser_type, options, bit):
+    super(PossibleIEDesktopBrowser, self).__init__(browser_type, options)
+    self._bit = bit
+
+  def __repr__(self):
+    return 'PossibleIEDesktopBrowser(browser_type=%s)' % self.browser_type
+
+  def Create(self):
+    # TODO Currently require that IEDriver.exe is in PATH.

[chrisgao (Use stgao instead), 2013/07/26 16:58:00]

IEDriver.exe -> IEDriverServer.exe

[tonyg, 2013/07/26 18:21:07]

Can we check for this and display a user-friendly message if it is not in the
path? Better yet, can we search for it and add it to the path?

[chrisgao (Use stgao instead), 2013/07/30 02:06:49]

Done.

[chrisgao (Use stgao instead), 2013/07/30 02:06:49]

We can delegate this to the underlying IE Driver as it already does this.
Yes, we can do that after we get both 32-bit and 64-bit IEDriverServer.exe into
code repos.
Which directory should IEDriverServer.exe live in?
tools/telemetry/third_party/webdrivers?

+    driver = webdriver.Ie()
+    backend = webdriver_browser_backend.WebDriverBrowserBackend(
+        driver, False, self._options)
+    b = browser.Browser(backend, win_platform_backend.WinPlatformBackend())
+    backend.SetBrowser(b)
+    return b
+
+  def SupportsOptions(self, options):
+    return True
+
+
+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' : os.getenv('PROGRAMFILES(X86)'),
+                        '64' : os.getenv('PROGRAMFILES')}

[chrisgao (Use stgao instead), 2013/07/26 16:58:00]

According to https://code.google.com/p/selenium/wiki/InternetExplorerDriver, the
"bit-ness" is determined by which version of IEDriverServer.exe is used. We
might need to upload both 32-bit and 64-bit of IEDriverServer.exe later on when
needed.

[tonyg, 2013/07/26 18:21:07]

There is also code in desktop_browser_finder.py that does this. Can we share it?
Should we?

[chrisgao (Use stgao instead), 2013/07/30 02:06:49]

I'm afraid we can't share much of the code, because it seems quite different
from that in desktop_browser_finder.py. Let's keep as it is.

+
+    for bit, path in win_search_paths.iteritems():

[tonyg, 2013/07/26 18:21:07]

s/bit/architecture/

[chrisgao (Use stgao instead), 2013/07/30 02:06:49]

Done.

+      if not path:
+        continue
+      if os.path.exists(os.path.join(path, ie_path)):
+        browsers.append(
+            PossibleIEDesktopBrowser('webdriver.ie%s' % bit, options, bit))
+
+  return browsers