Add initial code to do filename munging in the FileSystem....

chrome/browser/file_system/browser_file_system_helper.cc

 // Copyright (c) 2010 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.
 
 #include "chrome/browser/file_system/browser_file_system_helper.h"
 
 #include "base/file_path.h"
 #include "base/command_line.h"
 #include "chrome/browser/browser_thread.h"
 #include "chrome/common/chrome_switches.h"
 
 scoped_refptr<fileapi::FileSystemContext> CreateFileSystemContext(
         const FilePath& profile_path, bool is_incognito) {
   return new fileapi::FileSystemContext(
       BrowserThread::GetMessageLoopProxyForThread(BrowserThread::FILE),
       BrowserThread::GetMessageLoopProxyForThread(BrowserThread::IO),
       profile_path,
       is_incognito,
       CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kAllowFileAccessFromFiles),
       CommandLine::ForCurrentProcess()->HasSwitch(
-          switches::kUnlimitedQuotaForFiles));
+          switches::kUnlimitedQuotaForFiles),
+      true);  // TODO(ericu): Don't check this in!
 }