Refactor FileSystemOperation to take callback for each method.

content/browser/file_system/file_system_dispatcher_host.h

Index: content/browser/file_system/file_system_dispatcher_host.h
diff --git a/content/browser/file_system/file_system_dispatcher_host.h b/content/browser/file_system/file_system_dispatcher_host.h
index ebce21452676d74d07ed398d8b8ce3d3ad0d08c0..6660f33dc27dde454c94e2ac5f5fcecf914dcd9b 100644
--- a/content/browser/file_system/file_system_dispatcher_host.h
+++ b/content/browser/file_system/file_system_dispatcher_host.h
@@ -8,7 +8,9 @@
 #include <set>
 
 #include "base/basictypes.h"
+#include "base/file_util_proxy.h"
 #include "base/id_map.h"
+#include "base/platform_file.h"
 #include "content/public/browser/browser_message_filter.h"
 #include "webkit/fileapi/file_system_types.h"
 
@@ -88,6 +90,30 @@ class FileSystemDispatcherHost : public content::BrowserMessageFilter {
   void OnSyncGetPlatformPath(const GURL& path,
                              FilePath* platform_path);
 
+  // Callback functions to be used when each file operation is finished.
+  void DidFinish(int request_id, base::PlatformFileError result);
+  void DidCancel(int request_id, base::PlatformFileError result);
+  void DidGetMetadata(int request_id,
+                      base::PlatformFileError result,
+                      const base::PlatformFileInfo& info,
+                      const FilePath& platform_path);
+  void DidReadDirectory(int request_id,
+                        base::PlatformFileError result,
+                        const std::vector<base::FileUtilProxy::Entry>& entries,
+                        bool has_more);
+  void DidOpenFile(int request_id,
+                   base::PlatformFileError result,
+                   base::PlatformFile file,
+                   base::ProcessHandle peer_handle);
+  void DidWrite(int request_id,
+                base::PlatformFileError result,
+                int64 bytes,
+                bool complete);
+  void DidOpenFileSystem(int request_id,
+                         base::PlatformFileError result,
+                         const std::string& name,
+                         const GURL& root);
+
   // Creates a new FileSystemOperationInterface based on |target_path|.
   fileapi::FileSystemOperationInterface* GetNewOperation(
       const GURL& target_path,