Add Stream support to WebBlobRegistry and FileAPIMessageFilter.

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.
 // Multiply-included message file, hence no include guard.
 
 #include "content/public/common/common_param_traits.h"
 #include "ipc/ipc_message_macros.h"
 #include "webkit/common/blob/blob_data.h"
 
 #define IPC_MESSAGE_START BlobMsgStart
 
 // Blob messages sent from the renderer to the browser.
 
 // Registers a blob as being built.
 IPC_MESSAGE_CONTROL1(BlobHostMsg_StartBuildingBlob,
                      GURL /* url */)
 
-// Appends data to a blob being built.
+// Registers a stream as being built.
+IPC_MESSAGE_CONTROL2(BlobHostMsg_StartBuildingStream,
+                     GURL /* url */,
+                     std::string /* content_type */)
+
+// Appends data to a blob or stream being built.
 IPC_MESSAGE_CONTROL2(BlobHostMsg_AppendBlobDataItem,
                      GURL /* url */,
                      webkit_blob::BlobData::Item)
 
 // Appends data to a blob being built.
 IPC_SYNC_MESSAGE_CONTROL3_0(BlobHostMsg_SyncAppendSharedMemory,
                             GURL /* url */,
                             base::SharedMemoryHandle,
                             size_t /* buffer size */)
 
-// Finishes building a blob.
+// Finishes building a blob or stream.
 IPC_MESSAGE_CONTROL2(BlobHostMsg_FinishBuildingBlob,
                      GURL /* url */,
                      std::string /* content_type */)
 
-// Creates a new blob that's a clone of an existing src blob.
-// The source blob must be fully built.
+// Creates a new blob (or stream) that's a clone of an existing src blob (or
+// stream). The source blob (or stream) must be fully built.
 IPC_MESSAGE_CONTROL2(BlobHostMsg_CloneBlob,
                      GURL /* url */,
                      GURL /* src_url */)
 
-// Removes a blob.
+// Removes a blob or stream.
 IPC_MESSAGE_CONTROL1(BlobHostMsg_RemoveBlob,
                      GURL /* url */)