Provide child/frame IDs for WebSocket handshake request

content/public/browser/websocket_handshake_request_info.h

+// Copyright 2016 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.
+
+#ifndef CONTENT_PUBLIC_BROWSER_WEBSOCKET_HANDSHAKE_REQUEST_INFO_H_
+#define CONTENT_PUBLIC_BROWSER_WEBSOCKET_HANDSHAKE_REQUEST_INFO_H_
+
+#include "content/common/content_export.h"
+
+namespace net {
+class URLRequest;
+}  // namespace net
+
+namespace content {
+
+// WebSocketHandshakeRequestInfo provides additional information attached to
+// a net::URLRequest.
+class WebSocketHandshakeRequestInfo {
+ public:
+  virtual ~WebSocketHandshakeRequestInfo() {}
+  // Returns the ID of the child process where the WebSocket connection lives.
+  virtual int GetChildId() const = 0;
+  // Returns the ID of the renderrer frame where the WebSocket connection lives.

[jam, 2016/10/12 15:59:28]

nit: renderer

[yhirano, 2016/10/13 05:55:18]

Done.

+  virtual int GetFrameId() const = 0;

[jam, 2016/10/12 15:59:28]

call this GetRenderFrameID() to make it clear that it's a routing id of a
RenderFrame. a frame id is ambiguous because we also have frame tree id :)

[yhirano, 2016/10/13 05:55:18]

Done.

+
+  // Returns the WebSocketHandshakeRequestInfo instance attached to the given
+  // URLRequest. Returns nullptr when no instance is attached.
+  CONTENT_EXPORT static const WebSocketHandshakeRequestInfo* ForRequest(
+      const net::URLRequest* request);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_PUBLIC_BROWSER_WEBSOCKET_HANDSHAKE_REQUEST_INFO_H_