[BlobAsync] Disk support for blob storage

content/common/fileapi/webblob_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 HTML5 Blob and Stream.
 // Multiply-included message file, hence no include guard.
 
 #include <stddef.h>
 
 #include <set>
@@ skipping 30 matching lines @@
   IPC_STRUCT_TRAITS_MEMBER(handle_index)
   IPC_STRUCT_TRAITS_MEMBER(handle_offset)
 IPC_STRUCT_TRAITS_END()
 
 IPC_STRUCT_TRAITS_BEGIN(storage::BlobItemBytesResponse)
   IPC_STRUCT_TRAITS_MEMBER(request_number)
   IPC_STRUCT_TRAITS_MEMBER(inline_data)
   IPC_STRUCT_TRAITS_MEMBER(time_file_modified)
 IPC_STRUCT_TRAITS_END()
 
-// This message is to tell the browser that we will be building a blob.
-IPC_MESSAGE_CONTROL4(BlobStorageMsg_RegisterBlobUUID,
-                     std::string /* uuid */,
-                     std::string /* content_type */,
-                     std::string /* content_disposition */,
-                     std::set<std::string> /* referenced_blob_uuids */)
-
-// The DataElements are used to:
+// This message is to tell the browser that we will be building a blob. The
+// DataElements are used to:
 // * describe & transport non-memory resources (blobs, files, etc)
 // * describe the size of memory items
 // * 'shortcut' transport the memory up to the IPC limit so the browser can use
 //   it if it's not currently full.
 // See https://bit.ly/BlobStorageRefactor
-IPC_MESSAGE_CONTROL2(BlobStorageMsg_StartBuildingBlob,
+IPC_MESSAGE_CONTROL4(BlobStorageMsg_RegisterBlob,
                      std::string /* uuid */,
+                     std::string /* content_type */,
+                     std::string /* content_disposition */,
                      std::vector<storage::DataElement> /* item_descriptions */)
 
 IPC_MESSAGE_CONTROL4(
     BlobStorageMsg_RequestMemoryItem,
     std::string /* uuid */,
     std::vector<storage::BlobItemBytesRequest> /* requests */,
     std::vector<base::SharedMemoryHandle> /* memory_handles */,
     std::vector<IPC::PlatformFileForTransit> /* file_handles */)
 
 IPC_MESSAGE_CONTROL2(
@@ skipping 48 matching lines @@
                      GURL /* url */)
 
 // Creates a new stream that's a clone of an existing src stream.
 IPC_MESSAGE_CONTROL2(StreamHostMsg_Clone,
                      GURL /* url */,
                      GURL /* src_url */)
 
 // Removes a stream.
 IPC_MESSAGE_CONTROL1(StreamHostMsg_Remove,
                      GURL /* url */)