Let pyauto create an attached webdriver instance to manipulate web pages.

chrome/test/pyautolib/pyauto_paths.py

+#!/usr/bin/python
+# Copyright (c) 2011 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.
+
+"""Common paths for pyauto tests."""
+
+import os
+import sys
+
+
+def GetSourceDir():
+  """Returns src/ directory."""
+  script_dir = os.path.abspath(os.path.dirname(__file__))
+  return os.path.join(script_dir, os.pardir, os.pardir, os.pardir)
+
+
+def GetThirdPartyDir():
+  """Returns src/third_party directory."""
+  return os.path.join(GetSourceDir(), 'third_party')
+
+
+def GetBuildDirs():
+  """Returns list of possible build directories."""
+  build_dirs = {
+      'linux2': [ os.path.join('out', 'Debug'),
+                  os.path.join('sconsbuild', 'Debug'),
+                  os.path.join('out', 'Release'),
+                  os.path.join('sconsbuild', 'Release')],
+      'linux3': [ os.path.join('out', 'Debug'),
+                  os.path.join('sconsbuild', 'Debug'),
+                  os.path.join('out', 'Release'),
+                  os.path.join('sconsbuild', 'Release')],
+      'darwin': [ os.path.join('xcodebuild', 'Debug'),
+                  os.path.join('xcodebuild', 'Release')],
+      'win32':  [ os.path.join('chrome', 'Debug'),
+                  os.path.join('build', 'Debug'),
+                  os.path.join('chrome', 'Release'),
+                  os.path.join('build', 'Release')],
+      'cygwin': [ os.path.join('chrome', 'Debug'),
+                  os.path.join('chrome', 'Release')],
+  }
+  src_dir = GetSourceDir()
+  return map(lambda dir: os.path.join(src_dir, dir),
+             build_dirs.get(sys.platform, []))
+
+
+def GetChromeDriverExe():
+  """Returns path to ChromeDriver executable, or None if cannot be found."""
+  exe_name = 'chromedriver'
+  if sys.platform == 'win32':
+    exe_name += '.exe'
+  for dir in GetBuildDirs():
+    exe = os.path.join(dir, exe_name)
+    if os.path.exists(exe):
+      return exe
+  return None