Make CEF compliant with Google/Chromium style (issue #473).

- Add a new check_style tool based on Google's cpplint that can be used to verify compliance of pending changes and specific files/directories.
- Update existing CEF source code to be compliant with the style requirements.

git-svn-id: https://chromiumembedded.googlecode.com/svn/trunk@463 5089003a-bbd8-11dd-ad1f-f1f9622dbc98

tools/git_util.py

@@ -18,3 +18,7 @@ def get_svn_revision(path=".", branch="master"):
         raise
     return svn_rev
 
+def get_changed_files(path="."):
+  """ Retrieves the list of changed files. """
+  # not implemented
+  return []