Stackable file_util for FileAPIs. Sample code for discussion. Incomplete. Cannot be compiled.

webkit/fileapi/file_system_url_request_job.cc

Index: webkit/fileapi/file_system_url_request_job.cc
diff --git a/webkit/fileapi/file_system_url_request_job.cc b/webkit/fileapi/file_system_url_request_job.cc
index 3eb0842c143a4b8c88609c05606a641aecfa089c..39912f99de8b6846009ede6f34812032d99334f0 100644
--- a/webkit/fileapi/file_system_url_request_job.cc
+++ b/webkit/fileapi/file_system_url_request_job.cc
@@ -5,7 +5,6 @@
 #include "webkit/fileapi/file_system_url_request_job.h"
 
 #include "base/compiler_specific.h"
-#include "base/file_util_proxy.h"
 #include "base/message_loop.h"
 #include "base/platform_file.h"
 #include "base/threading/thread_restrictions.h"
@@ -18,6 +17,7 @@
 #include "net/base/net_util.h"
 #include "net/http/http_util.h"
 #include "net/url_request/url_request.h"
+#include "webkit/fileapi/file_system_file_util_proxy.h"
 #include "webkit/fileapi/file_system_path_manager.h"
 #include "webkit/fileapi/file_system_util.h"
 
@@ -154,7 +154,9 @@ void FileSystemURLRequestJob::DidGetRootPath(bool success,
 
   absolute_file_path_ = root_path.Append(relative_file_path_);
 
-  base::FileUtilProxy::GetFileInfo(file_thread_proxy_, absolute_file_path_,
+  fileapi::FileSystemFileUtilProxy::GetFileInfo(
+      file_system_operation_context_.get(),
+      file_thread_proxy_, absolute_file_path_,
       callback_factory_.NewCallback(&FileSystemURLRequestJob::DidResolve));
 }
 
@@ -181,7 +183,8 @@ void FileSystemURLRequestJob::DidResolve(base::PlatformFileError error_code,
   }
 
   if (!is_directory_) {
-    base::FileUtilProxy::CreateOrOpen(
+    fileapi::FileSystemFileUtilProxy::CreateOrOpen(
+        file_system_operation_context_.get(),
         file_thread_proxy_, absolute_file_path_, kFileFlags,
         callback_factory_.NewCallback(&FileSystemURLRequestJob::DidOpen));
   } else