Add IPC for new WebSocket impl.

content/common/websocket_messages.h

+// Copyright (c) 2013 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 file, hence no include guard.
+
+// This file defines the IPCs for the browser-side implementation of
+// WebSockets. For the legacy renderer-side implementation, see
+// socket_stream_messages.h.
+// TODO(ricea): Fix this comment when the legacy implementation has been
+// removed.
+//
+// This IPC interface is based on the WebSocket multiplexing draft spec,
+// http://tools.ietf.org/html/draft-ietf-hybi-websocket-multiplexing-09
+
+#include <string>
+#include <vector>
+
+#include "base/basictypes.h"
+#include "content/common/content_export.h"
+#include "content/common/websocket.h"
+#include "googleurl/src/gurl.h"
+#include "ipc/ipc_message_macros.h"
+#include "ipc/ipc_param_traits.h"
+
+#undef IPC_MESSAGE_EXPORT
+#define IPC_MESSAGE_EXPORT CONTENT_EXPORT
+#define IPC_MESSAGE_START WebSocketMsgStart
+
+// WebSocket messages sent from the renderer to the browser.
+
+// Open new virtual WebSocket connection to |socket_url|. |channel_id| is an
+// identifier chosen by the renderer for the new channel. It cannot correspond
+// to an existing open channel, and must be between 1 and
+// 0x7FFFFFFF. |requested_protocols| is a list of tokens identifying
+// sub-protocols the renderer would like to use, as described in RFC6455
+// "Subprotocols Using the WebSocket Protocol".
+//
+// The browser process will not send |channel_id| as-is to the remote server; it
+// will try to use a short id on the wire. This saves the renderer from
+// having to try to choose the ids cleverly.
+IPC_MESSAGE_CONTROL4(WebSocketHostMsg_AddChannelRequest,
+                     int /* channel_id */,
+                     GURL /* socket_url */,
+                     std::vector<std::string> /* requested_protocols */,
+                     GURL /* origin */);
+
+// Web Socket messages sent from the browser to the renderer.
+
+// Respond to an AddChannelRequest for channel |channel_id|. |channel_id| is
+// scoped to the renderer process; while it is unique per-renderer, the browser
+// may have multiple renderers using the same id. If |fail| is true, the channel
+// could not be established (the cause of the failure is not provided to the
+// renderer in order to limit its ability to abuse WebSockets to perform network
+// probing, etc.). If |fail| is set then the |channel_id| is available for
+// re-use. |selected_protocol| is the sub-protocol the server selected,
+// or empty if no sub-protocol was selected.
+IPC_MESSAGE_CONTROL3(WebSocketMsg_AddChannelResponse,
+                     int /* channel_id */,
+                     bool /* fail */,
+                     std::string /* selected_protocol */);
+
+// Tell the renderer how many AddChannelRequest messages it may send before the
+// next NewChannelSlot message. |new_slots| is a positive integer indicating the
+// number of message slots to add. |new_channel_quota| is the initial send quota
+// for a new channel.
+// The network protocol contains a "fallback" field that indicates that new
+// channels should be established over a new connection; this is omitted here as
+// the mapping of virtual connections to physical connections is not exposed to
+// the renderer.
+IPC_MESSAGE_CONTROL2(WebSocketMsg_NewChannelSlot,

[Adam Rice, 2013/05/20 09:20:18]

After discussion with yhirano and tyoshino, we concluded we don't have a
concrete use case for this IPC right now. As such, I have removed it.

The initial flow control for new channels in both directions will always be zero
until a FlowControl message is sent.

+                     int64 /* new_slots */,
+                     int64 /* new_channel_quota */);
+
+// WebSocket messages that can be sent in either direction.
+
+IPC_ENUM_TRAITS(content::WebSocketMessageType);
+
+// Send a non-control frame on |channel_id|. If the sender is the renderer, it
+// will be sent to the remote server. If the sender is the browser, it comes
+// from the remote server. |fin| indicates that this frame is the last in the
+// current message. |type| is the type of the message. On the first frame of a
+// message, it must be set to either kWebSocketText or kWebSocketBinary. On
+// subsequent frames, it must be set to kWebSocketContinuation, and the type is
+// the same as that of the first message. If |type| is kWebSocketText, then the
+// concatenation of the |data| from every frame in the message must be valid
+// UTF-8. If |fin| is not set, |data| must be non-empty.
+IPC_MESSAGE_CONTROL4(WebSocketMsg_SendFrame,
+                     int /* channel_id */,
+                     bool /* fin */,
+                     content::WebSocketMessageType /* type */,
+                     std::vector<char> /* data */);
+
+// Add |quota| tokens of send quota for channel |channel_id|. |quota| must be a
+// positive integer. The total available quota must never exceed
+// 0x7FFFFFFFFFFFFFFF tokens.
+IPC_MESSAGE_CONTROL2(WebSocketMsg_FlowControl,
+                     int /* channel_id */,
+                     int64 /* quota */);
+
+// Drop the channel.
+// When sent by the renderer, this will cause a DropChannel message to be sent
+// if the multiplex extension is in use, otherwise a Close message will be sent
+// and the TCP/IP connection will be closed.
+// When sent by the browser, this indicates that a Close or DropChannel has been
+// received, the connection was closed, or a network or protocol error
+// occurred. On receiving DropChannel, the renderer process may consider the
+// |channel_id| available for reuse by a new AddChannelRequest.
+// |code| is one of the reason codes specified in RFC6455 or
+// draft-ietf-hybi-websocket-multiplexing-09. |reason|, if non-empty, is a
+// UTF-8 encoded string which may be useful for debugging but is not necessarily
+// human-readable, as supplied by the server in the Close or DropChannel
+// message.
+IPC_MESSAGE_CONTROL3(WebSocketMsg_DropChannel,
+                     int /* channel_id */,
+                     unsigned short /* code */,
+                     std::string /* reason */);