Implement content::WebSocketBlobSender

content/common/websocket_messages.h

Index: content/common/websocket_messages.h
diff --git a/content/common/websocket_messages.h b/content/common/websocket_messages.h
index e0af254960e62e89adb95258b5f209435c7bad31..7e6d8eb69cf32bf7292048a3740ae3b57682c549 100644
--- a/content/common/websocket_messages.h
+++ b/content/common/websocket_messages.h
@@ -73,6 +73,23 @@ IPC_MESSAGE_ROUTED4(WebSocketHostMsg_AddChannelRequest,
                     url::Origin /* origin */,
                     int /* render_frame_id */)
 
+// Send a complete binary WebSocket message consisting of the Blob identified by
+// |uuid|. The message will be split into frames as necessary. |expected_size|
+// must match the browser's idea of the size of the Blob to prevent flow control
+// from becoming desynchronised. If it does not match the connection will be
+// terminated with a WebSocketMsg_NotifyFailure message. On success, the browser
+// will have consumed |expected_size| bytes of flow control send quota and the
+// renderer needs to subtract that from its running total of flow control send
+// quota. See the design doc at
+// https://docs.google.com/document/d/1CDiXB9pBumhFVVfmIn1CRI6v6byxyqWu2urEE9xp714/edit
+// SendFrame or SendBlob IPCs must not be sent by the renderer until the
+// BlobSendComplete message has been received from the browser. The renderer
+// should retain a reference to the Blob until either a BlobSendComplete or
+// NotifyFailure IPC is received.
+IPC_MESSAGE_ROUTED2(WebSocketHostMsg_SendBlob,
+                    std::string /* uuid */,
+                    uint64_t /* expected_size */)
+
 // WebSocket messages sent from the browser to the renderer.
 
 // Respond to an AddChannelRequest. |selected_protocol| is the sub-protocol the
@@ -111,6 +128,11 @@ IPC_MESSAGE_ROUTED1(WebSocketMsg_NotifyFinishOpeningHandshake,
 IPC_MESSAGE_ROUTED1(WebSocketMsg_NotifyFailure,
                     std::string /* message */)
 
+// Indicates tbat the current Blob has finished sending. The renderer can
+// release its reference on the Blob, and may now use SendFrame or SendBlob to
+// send more messages.
+IPC_MESSAGE_ROUTED0(WebSocketMsg_BlobSendComplete);
+
 // WebSocket messages that can be sent in either direction.
 
 // Send a non-control frame to the channel.