Revert 214599 "Revert 214160 "Implement Worker-MainThread bridge..."

trunk/src/content/child/fileapi/file_system_dispatcher.h

Index: trunk/src/content/child/fileapi/file_system_dispatcher.h
===================================================================
--- trunk/src/content/child/fileapi/file_system_dispatcher.h	(revision 214653)
+++ trunk/src/content/child/fileapi/file_system_dispatcher.h	(working copy)
@@ -40,7 +40,8 @@
       const base::PlatformFileInfo& file_info)> MetadataCallback;
   typedef base::Callback<void(
       const base::PlatformFileInfo& file_info,
-      const base::FilePath& platform_path)> CreateSnapshotFileCallback;
+      const base::FilePath& platform_path,
+      int request_id)> CreateSnapshotFileCallback;
   typedef base::Callback<void(
       const std::vector<fileapi::DirectoryEntry>& entries,
       bool has_more)> ReadDirectoryCallback;
@@ -122,6 +123,9 @@
   // raw PlatformFile returned from OpenFile.
   void NotifyCloseFile(int file_open_id);
 
+  // The caller must send FileSystemHostMsg_DidReceiveSnapshot message
+  // with |request_id| passed to |success_callback| after the snapshot file
+  // is successfully received.
   void CreateSnapshotFile(const GURL& file_path,
                           const CreateSnapshotFileCallback& success_callback,
                           const StatusCallback& error_callback);