Look in out/ as well as xcodebuild/ for mac, in case the user is using the make build.

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')],
-  }
+  # List of dirs that can contain a Debug/Release build.
+  outer_dirs = {
+      'linux2': ['out', 'sconsbuild'],
+      'linux3': ['out', 'sconsbuild'],
+      'darwin': ['xcodebuild', 'out'],

[Nirnimesh, 2011/08/30 16:49:11]

reverse the order? 'out', 'xcodebuild'

+      'win32':  ['chrome', 'build'],
+      'cygwin': ['chrome'],
+  }.get(sys.platform, [])
   src_dir = GetSourceDir()
-  return map(lambda dir: os.path.join(src_dir, dir),
-             build_dirs.get(sys.platform, []))
+  build_dirs = []
+  for dir in outer_dirs:
+    build_dirs += [os.path.join(src_dir, dir, 'Debug')]
+    build_dirs += [os.path.join(src_dir, dir, 'Release')]
+  return build_dirs
 
 
 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