diff --git a/tools/check_revision.py b/tools/check_revision.py
new file mode 100644
index 000000000..47e709237
--- /dev/null
+++ b/tools/check_revision.py
@@ -0,0 +1,60 @@
+# Copyright (c) 2011 The Chromium Embedded Framework Authors. All rights
+# reserved. Use of this source code is governed by a BSD-style license that
+# can be found in the LICENSE file.
+
+from file_util import *
+from optparse import OptionParser
+from svn_util import *
+import sys
+
+# cannot be loaded as a module
+if __name__ != "__main__":
+    sys.stderr.write('This file cannot be loaded as a module!')
+    sys.exit()
+
+
+# parse command-line options
+disc = """
+This utility checks that the correct Chromium revision is being used.
+"""
+
+parser = OptionParser(description=disc)
+parser.add_option('-q', '--quiet',
+                  action='store_true', dest='quiet', default=False,
+                  help='do not output detailed status information')
+(options, args) = parser.parse_args()
+
+# The CEF root directory is the parent directory of _this_ script.
+cef_dir = os.path.abspath(os.path.join(os.path.dirname(__file__), os.pardir))
+
+# Retrieve the CEF SVN info.
+cef_info = get_svn_info(cef_dir)
+if not options.quiet:
+  sys.stdout.write('Using CEF revision '+cef_info['revision']+' @ '+\
+      cef_info['url']+"\n")
+
+# Retrieve the Chromium SVN info.
+chromium_info = get_svn_info(os.path.join(cef_dir, os.pardir))
+if not options.quiet:
+  sys.stdout.write('Using Chromium revision '+chromium_info['revision']+' @ '+\
+      chromium_info['url']+"\n")
+
+# Parse the compatibility file contents.
+compat_file = os.path.join(cef_dir, 'CHROMIUM_BUILD_COMPATIBILITY.txt')
+config = eval(read_file(compat_file), {'__builtins__': None}, None)
+
+error = False
+
+if chromium_info['url'] != config['chromium_url']:
+  error = True
+  sys.stderr.write("\nWARNING: Incorrect Chromium URL; found "+\
+      chromium_info['url']+', expected '+config['chromium_url']+"\n")
+
+if chromium_info['revision'] != config['chromium_revision']:
+  error = True
+  sys.stderr.write("\nWARNING: Incorrect Chromium revision; found "+\
+      chromium_info['revision']+', expected '+config['chromium_revision']+"\n")
+      
+if error:
+  sys.stderr.write("\nPlease see CHROMIUM_BUILD_COMPATIBILITY.txt for "\
+      "instructions.\n")
diff --git a/tools/gclient_hook.py b/tools/gclient_hook.py
index b88bd2699..15fd47926 100644
--- a/tools/gclient_hook.py
+++ b/tools/gclient_hook.py
@@ -9,6 +9,10 @@ import os, sys
 # The CEF root directory is the parent directory of _this_ script.
 cef_dir = os.path.abspath(os.path.join(os.path.dirname(__file__), os.pardir))
 
+print "\nChecking CEF and Chromium revisions..."
+gyper = [ 'python', 'tools/check_revision.py' ]
+RunAction(cef_dir, gyper)
+
 print "\nGenerating CEF version header file..."
 gyper = [ 'python', 'tools/make_version_header.py',
           '--header', 'version.h',
diff --git a/tools/svn_util.py b/tools/svn_util.py
index 198821dbb..0d01fe760 100644
--- a/tools/svn_util.py
+++ b/tools/svn_util.py
@@ -3,16 +3,38 @@
 # can be found in the LICENSE file.
 
 import os
+import urllib
+
+def check_url(url):
+  """ Check the URL and raise an exception if invalid. """
+  if ':' in url[:7]:
+    parts = url.split(':', 1)
+    if (parts[0] == 'http' or parts[0] == 'https') and \
+        parts[1] == urllib.quote(parts[1]):
+      return url
+  sys.stderr.write('Invalid URL: '+url+"\n")
+  raise Exception('Invalid URL: '+url)
+
+def get_svn_info(path):
+  """ Retrieves the URL and revision from svn info. """
+  url = 'None'
+  rev = 'None'
+  if path[0:4] == 'http' or os.path.exists(path):
+    try:
+      stream = os.popen('svn info '+path)
+      for line in stream:
+        if line[0:4] == "URL:":
+          url = check_url(line[5:-1])
+        elif line[0:9] == "Revision:":
+          rev = str(int(line[10:-1]))
+    except IOError, (errno, strerror):
+      sys.stderr.write('Failed to read svn info: '+strerror+"\n")
+      raise
+  return {'url': url, 'revision': rev}
 
 def get_revision(path = '.'):
-    """ Retrieves the revision number from stdin. """
-    try:
-        stream = os.popen('svn info '+path);
-        # read the revision number
-        for line in stream:
-            if line[0:9] == "Revision:":
-                return line[10:-1];
-        raise IOError("Revision line not found.")
-    except IOError, (errno, strerror):
-        sys.stderr.write('Failed to read revision from "svn info": ' + strerror)
-        raise
+  """ Retrieves the revision from svn info. """
+  info = get_svn_info(path)
+  if info['revision'] == 'None':
+    raise Exception('Unable to retrieve SVN revision for "'+path+'"')
+  return info['revision']