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

webkit/fileapi/sandboxed_file_system_operation.h

Index: webkit/fileapi/sandboxed_file_system_operation.h
===================================================================
--- webkit/fileapi/sandboxed_file_system_operation.h	(revision 72915)
+++ webkit/fileapi/sandboxed_file_system_operation.h	(working copy)
@@ -11,6 +11,7 @@
 
 namespace fileapi {
 
+class ObfuscatedFileUtilProxy;
 class SandboxedFileSystemContext;
 
 // This class provides a 'sandboxed' access to the underlying file system,
@@ -54,6 +55,9 @@
                  const base::Time& last_access_time,
                  const base::Time& last_modified_time);
 
+ protected:
+  virtual base::FileUtilProxyBase* file_util_proxy() const;
+
  private:
   enum SandboxedFileSystemOperationType {
     kOperationOpenFileSystem = 100,