FileSystem mods: Changes to snapshot file creation to remove dependencies on blobs.

content/common/fileapi/file_system_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.
 
 // IPC messages for the file system.
 // Multiply-included message file, hence no include guard.
 
 #include "base/files/file_util_proxy.h"
 #include "googleurl/src/gurl.h"
 #include "ipc/ipc_message_macros.h"
@@ skipping 17 matching lines @@
                      std::string /* name */,
                      GURL /* root_url */)
 
 // WebFileSystem response messages.
 IPC_MESSAGE_CONTROL1(FileSystemMsg_DidSucceed,
                      int /* request_id */)
 IPC_MESSAGE_CONTROL3(FileSystemMsg_DidReadMetadata,
                      int /* request_id */,
                      base::PlatformFileInfo,
                      base::FilePath /* true platform path, where possible */)
+IPC_MESSAGE_CONTROL3(FileSystemMsg_DidCreateSnapshotFile,
+                     int /* request_id */,
+                     base::PlatformFileInfo,
+                     base::FilePath /* true platform path */)
 IPC_MESSAGE_CONTROL3(FileSystemMsg_DidReadDirectory,
                      int /* request_id */,
                      std::vector<base::FileUtilProxy::Entry> /* entries */,
                      bool /* has_more */)
 IPC_MESSAGE_CONTROL3(FileSystemMsg_DidWrite,
                      int /* request_id */,
                      int64 /* byte count */,
                      bool /* complete */)
 IPC_MESSAGE_CONTROL2(FileSystemMsg_DidOpenFile,
                      int /* request_id */,
@@ skipping 88 matching lines @@
 // Pepper's OpenFile message.
 IPC_MESSAGE_CONTROL3(FileSystemHostMsg_OpenFile,
                      int /* request id */,
                      GURL /* file path */,
                      int /* file flags */)
 
 // Pepper's NotifyCloseFile message.
 IPC_MESSAGE_CONTROL1(FileSystemHostMsg_NotifyCloseFile,
                      GURL /* file path */)
 
-// WebFileSystem::createSnapshotFileAndReadMetadata() message.
-IPC_MESSAGE_CONTROL3(FileSystemHostMsg_CreateSnapshotFile,
+// DEPRECATED
+IPC_MESSAGE_CONTROL3(FileSystemHostMsg_CreateSnapshotFile_Deprecated,
                      int /* request_id */,
                      GURL /* blob_url */,
                      GURL /* file_path */)
 
+// WebFileSystem::createSnapshotFileAndReadMetadata() message.
+IPC_MESSAGE_CONTROL2(FileSystemHostMsg_CreateSnapshotFile,
+                     int /* request_id */,
+                     GURL /* file_path */)
+
+// Renderers are expected to send this message after having processed
+// the FileSystemMsg_DidCreateSnapshotFile message. In particular,
+// after having created a BlobDataHandle backed by the snapshot file.
+IPC_MESSAGE_CONTROL1(FileSystemHostMsg_DidReceiveSnapshotFile,
+                     int /* request_id */)
+
 // For Pepper's URL loader.
 IPC_SYNC_MESSAGE_CONTROL1_1(FileSystemHostMsg_SyncGetPlatformPath,
                             GURL /* file path */,
                             base::FilePath /* platform_path */)
 
 // Pre- and post-update notifications for ppapi implementation.
 IPC_MESSAGE_CONTROL1(FileSystemHostMsg_WillUpdate,
                      GURL /* file_path */)
 
 IPC_MESSAGE_CONTROL2(FileSystemHostMsg_DidUpdate,
                      GURL /* file_path */,
                      int64 /* delta */)