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diff --git a/chromium/third_party/blink/renderer/platform/loader/fetch/resource_load_timing.h b/chromium/third_party/blink/renderer/platform/loader/fetch/resource_load_timing.h
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+/*
+ * Copyright (C) 2010 Google, Inc. All Rights Reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_LOADER_FETCH_RESOURCE_LOAD_TIMING_H_
+#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_LOADER_FETCH_RESOURCE_LOAD_TIMING_H_
+
+#include "base/memory/scoped_refptr.h"
+#include "third_party/blink/renderer/platform/platform_export.h"
+#include "third_party/blink/renderer/platform/wtf/ref_counted.h"
+#include "third_party/blink/renderer/platform/wtf/time.h"
+
+namespace blink {
+
+class PLATFORM_EXPORT ResourceLoadTiming
+    : public RefCounted<ResourceLoadTiming> {
+ public:
+  static scoped_refptr<ResourceLoadTiming> Create();
+
+  scoped_refptr<ResourceLoadTiming> DeepCopy();
+  bool operator==(const ResourceLoadTiming&) const;
+  bool operator!=(const ResourceLoadTiming&) const;
+
+  void SetDnsStart(TimeTicks);
+  void SetRequestTime(TimeTicks);
+  void SetProxyStart(TimeTicks);
+  void SetProxyEnd(TimeTicks);
+  void SetDnsEnd(TimeTicks);
+  void SetConnectStart(TimeTicks);
+  void SetConnectEnd(TimeTicks);
+  void SetWorkerStart(TimeTicks);
+  void SetWorkerReady(TimeTicks);
+  void SetSendStart(TimeTicks);
+  void SetSendEnd(TimeTicks);
+  void SetReceiveHeadersEnd(TimeTicks);
+  void SetSslStart(TimeTicks);
+  void SetSslEnd(TimeTicks);
+  void SetPushStart(TimeTicks);
+  void SetPushEnd(TimeTicks);
+
+  TimeTicks DnsStart() const { return dns_start_; }
+  TimeTicks RequestTime() const { return request_time_; }
+  TimeTicks ProxyStart() const { return proxy_start_; }
+  TimeTicks ProxyEnd() const { return proxy_end_; }
+  TimeTicks DnsEnd() const { return dns_end_; }
+  TimeTicks ConnectStart() const { return connect_start_; }
+  TimeTicks ConnectEnd() const { return connect_end_; }
+  TimeTicks WorkerStart() const { return worker_start_; }
+  TimeTicks WorkerReady() const { return worker_ready_; }
+  TimeTicks SendStart() const { return send_start_; }
+  TimeTicks SendEnd() const { return send_end_; }
+  TimeTicks ReceiveHeadersEnd() const { return receive_headers_end_; }
+  TimeTicks SslStart() const { return ssl_start_; }
+  TimeTicks SslEnd() const { return ssl_end_; }
+  TimeTicks PushStart() const { return push_start_; }
+  TimeTicks PushEnd() const { return push_end_; }
+
+  double CalculateMillisecondDelta(TimeTicks) const;
+
+ private:
+  ResourceLoadTiming();
+
+  // We want to present a unified timeline to Javascript. Using walltime is
+  // problematic, because the clock may skew while resources load. To prevent
+  // that skew, we record a single reference walltime when root document
+  // navigation begins. All other times are recorded using
+  // monotonicallyIncreasingTime(). When a time needs to be presented to
+  // Javascript, we build a pseudo-walltime using the following equation
+  // (m_requestTime as example):
+  //   pseudo time = document wall reference +
+  //                     (m_requestTime - document monotonic reference).
+
+  // All values from monotonicallyIncreasingTime(), in WTF::TimeTicks.
+  TimeTicks request_time_;
+  TimeTicks proxy_start_;
+  TimeTicks proxy_end_;
+  TimeTicks dns_start_;
+  TimeTicks dns_end_;
+  TimeTicks connect_start_;
+  TimeTicks connect_end_;
+  TimeTicks worker_start_;
+  TimeTicks worker_ready_;
+  TimeTicks send_start_;
+  TimeTicks send_end_;
+  TimeTicks receive_headers_end_;
+  TimeTicks ssl_start_;
+  TimeTicks ssl_end_;
+  TimeTicks push_start_;
+  TimeTicks push_end_;
+};
+
+}  // namespace blink
+
+#endif