This is the IPC and bits of the browser backend for FileWriter. The rest of...

chrome/common/render_messages_internal.h

 // 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.
 
 // This header is meant to be included in multiple passes, hence no traditional
 // header guard.
 // See ipc_message_macros.h for explanation of the macros and passes.
 
 #include <map>
 #include <string>
@@ skipping 1028 matching lines @@
   IPC_MESSAGE_CONTROL1(ViewMsg_FileSystem_DidSucceed,
                        int /* request_id */)
   IPC_MESSAGE_CONTROL2(ViewMsg_FileSystem_DidReadMetadata,
                        int /* request_id */,
                        base::PlatformFileInfo)
   IPC_MESSAGE_CONTROL3(ViewMsg_FileSystem_DidReadDirectory,
                        int /* request_id */,
                        std::vector<base::file_util_proxy::Entry> /* entries */,
                        bool /* has_more */)
 
+  IPC_MESSAGE_CONTROL3(ViewMsg_FileSystem_DidWrite,
+                       int /* request_id */,
+                       int64 /* byte count */,
+                       bool /* complete */)
   IPC_MESSAGE_CONTROL2(ViewMsg_FileSystem_DidFail,
                        int /* request_id */,
                        base::PlatformFileError /* error_code */)
 
   // The response to ViewHostMsg_AsyncOpenFile.
   IPC_MESSAGE_ROUTED3(ViewMsg_AsyncOpenFile_ACK,
                       base::PlatformFileError /* error_code */,
                       IPC::PlatformFileForTransit /* file descriptor */,
                       int /* message_id */)
 
@@ skipping 1118 matching lines @@
                               ViewHostMsg_CreateWorker_Params,
                               bool /* exists */,
                               int /* route_id */,
                               bool /* url_mismatch */)
 
   // A renderer sends this to the browser process when a document has been
   // detached. The browser will use this to constrain the lifecycle of worker
   // processes (SharedWorkers are shut down when their last associated document
   // is detached).
   IPC_MESSAGE_CONTROL1(ViewHostMsg_DocumentDetached,
-                       unsigned long long /* document_id */)
+                       uint64 /* document_id */)
 
   // A message sent to the browser on behalf of a renderer which wants to show
   // a desktop notification.
   IPC_MESSAGE_ROUTED1(ViewHostMsg_ShowDesktopNotification,
                       ViewHostMsg_ShowNotification_Params)
   IPC_MESSAGE_ROUTED1(ViewHostMsg_CancelDesktopNotification,
                       int /* notification_id */ )
   IPC_MESSAGE_ROUTED2(ViewHostMsg_RequestNotificationPermission,
                       GURL /* origin */,
                       int /* callback_context */)
@@ skipping 651 matching lines @@
   IPC_MESSAGE_CONTROL3(ViewHostMsg_FileSystem_Exists,
                        int /* request_id */,
                        FilePath /* path */,
                        bool /* is_directory */)
 
   // WebFileSystem::readDirectory() message.
   IPC_MESSAGE_CONTROL2(ViewHostMsg_FileSystem_ReadDirectory,
                        int /* request_id */,
                        FilePath /* path */)
 
+  // WebFileWriter::write() message.
+  IPC_MESSAGE_CONTROL4(ViewHostMsg_FileSystem_Write,
+                       int /* request id */,
+                       FilePath /* file path */,
+                       GURL /* blob URL */,
+                       int64 /* position */)
+
+  // WebFileWriter::truncate() message.
+  IPC_MESSAGE_CONTROL3(ViewHostMsg_FileSystem_Truncate,
+                       int /* request id */,
+                       FilePath /* file path */,
+                       int64 /* length */)
+
+  // WebFileWriter::cancel() message.
+  IPC_MESSAGE_CONTROL2(ViewHostMsg_FileSystem_CancelWrite,
+                       int /* request id */,
+                       int /* id of request to cancel */)
+
   //---------------------------------------------------------------------------
   // Blob messages:
 
   // Registers a blob URL referring to the specified blob data.
   IPC_MESSAGE_CONTROL2(ViewHostMsg_RegisterBlobUrl,
                        GURL /* url */,
                        scoped_refptr<webkit_blob::BlobData> /* blob_data */)
 
   // Registers a blob URL referring to the blob data identified by the specified
   // source URL.
   IPC_MESSAGE_CONTROL2(ViewHostMsg_RegisterBlobUrlFrom,
                        GURL /* url */,
                        GURL /* src_url */)
 
   // Unregister a blob URL.
   IPC_MESSAGE_CONTROL1(ViewHostMsg_UnregisterBlobUrl, GURL /* url */)
 
   // Suggest results -----------------------------------------------------------
 
   IPC_MESSAGE_ROUTED2(ViewHostMsg_SetSuggestResult,
                       int32 /* page_id */,
                       std::string /* suggest */)
 
 IPC_END_MESSAGES(ViewHost)