Add Network.setSendRequestIdHeader and use it in headless

content/browser/devtools/devtools_url_request_interceptor.h

+
+// Copyright 2017 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_BROWSER_DEVTOOLS_DEVTOOLS_URL_INTERCEPTOR_H_
+#define CONTENT_BROWSER_DEVTOOLS_DEVTOOLS_URL_INTERCEPTOR_H_
+
+#include "net/url_request/url_request_interceptor.h"
+
+namespace content {
+
+class DevtoolsUrlRequestInterceptor : public net::URLRequestInterceptor {

[pfeldman, 2017/02/27 17:30:22]

nuke this one.

[alex clarke (OOO till 29th), 2017/02/27 22:20:26]

Whoops that was intended for another patch.  It's gone.

+ public:
+};
+
+}  // namespace content
+
+#endif  // CHROME_BROWSER_DEVTOOLS_DEVTOOLS_URL_INTERCEPTOR_H_