[PPAPI] It is now possible to pass filesystems from JavaScript to NaCl modules.

ppapi/proxy/ppapi_messages.h

 // Copyright (c) 2012 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.
 
 // Multiply-included message header, no traditional include guard.
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/files/file_path.h"
@@ skipping 1273 matching lines @@
 
 // FileSystem
 IPC_MESSAGE_CONTROL1(PpapiHostMsg_FileSystem_Create,
                      PP_FileSystemType /* type */)
 IPC_MESSAGE_CONTROL1(PpapiHostMsg_FileSystem_Open,
                      int64_t /* expected_size */)
 IPC_MESSAGE_CONTROL0(PpapiPluginMsg_FileSystem_OpenReply)
 IPC_MESSAGE_CONTROL1(PpapiHostMsg_FileSystem_InitIsolatedFileSystem,
                      std::string /* fsid */)
 IPC_MESSAGE_CONTROL0(PpapiPluginMsg_FileSystem_InitIsolatedFileSystemReply)
+// Passed from renderer to browser. Creates an already-open file system with a
+// given |root_url| and |file_system_type|.
+IPC_MESSAGE_CONTROL2(PpapiHostMsg_FileSystem_CreateFromRenderer,
+                     std::string /* root_url */,
+                     PP_FileSystemType /* file_system_type */)
+// Nested within a ResourceVar for file systems being passed from the renderer
+// to the plugin. Creates an already-open file system resource on the plugin,
+// linked to the existing resource host given in the ResourceVar.
+IPC_MESSAGE_CONTROL1(PpapiPluginMsg_FileSystem_CreateFromPendingHost,
+                     PP_FileSystemType /* file_system_type */)
 
 // Flash DRM ------------------------------------------------------------------
 IPC_MESSAGE_CONTROL0(PpapiHostMsg_FlashDRM_Create)
 
 // Requests the device ID.
 IPC_MESSAGE_CONTROL0(PpapiHostMsg_FlashDRM_GetDeviceID)
 // Reply for GetDeviceID which includes the device ID as a string.
 IPC_MESSAGE_CONTROL1(PpapiPluginMsg_FlashDRM_GetDeviceIDReply,
                      std::string /* id */)
 
@@ skipping 652 matching lines @@
 IPC_MESSAGE_CONTROL1(PpapiHostMsg_Talk_RequestPermission,
                      PP_TalkPermission /* permission */)
 IPC_MESSAGE_CONTROL0(PpapiPluginMsg_Talk_RequestPermissionReply)
 IPC_MESSAGE_CONTROL0(PpapiHostMsg_Talk_StartRemoting)
 IPC_MESSAGE_CONTROL0(PpapiPluginMsg_Talk_StartRemotingReply)
 IPC_MESSAGE_CONTROL0(PpapiHostMsg_Talk_StopRemoting)
 IPC_MESSAGE_CONTROL0(PpapiPluginMsg_Talk_StopRemotingReply)
 IPC_MESSAGE_CONTROL1(PpapiPluginMsg_Talk_NotifyEvent, PP_TalkEvent /* event */)
 
 #endif  // !defined(OS_NACL) && !defined(NACL_WIN64)