[chromedriver] Fix waiting and downloading snapshot builds.

chrome/test/chromedriver/archive.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.
 
 """Downloads items from the Chromium continuous archive."""
 
 import os
 import platform
 import urllib
 
@@ skipping 61 matching lines @@
   """Returns the name for this platform on the archive site."""
   if util.IsWindows():
     return 'Win'
   elif util.IsMac():
     return 'Mac'
   elif util.IsLinux():
     if platform.architecture()[0] == '64bit':
       return 'Linux_x64'
     else:
       return 'Linux'
+
+def GetLatestSnapshotVersion():
+  """Returns the latest revision of snapshot build."""
+  return GetLatestRevision(GetSnapshotDownloadSite())
+
+def GetSnapshotDownloadSite():
+  """Returns the site to download snapshot build according to the platform.
+
+  For Linux 32-bit, it is chromium snapshot build.
+  For other platform, it is blink snapshot build.
+  Because there is no linux32 blink snapshot build.
+  """
+  if _GetDownloadPlatform() == 'Linux':
+    return Site.CHROMIUM_SNAPSHOT
+  else:
+    return Site.BLINK_SNAPSHOT