Enable ServerTiming support

third_party/WebKit/Source/core/timing/PerformanceBase.h

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  * Copyright (C) 2012 Intel 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 93 matching lines @@
 
   void addLongTaskTiming(double startTime,
                          double endTime,
                          const String& name,
                          const String& culpritFrameSrc,
                          const String& culpritFrameId,
                          const String& culpritFrameName);
 
   void addResourceTiming(const ResourceTimingInfo&);
 
+  enum class ShouldAddToBuffer {
+    Always,
+    Never,
+  };
+  void addServerTiming(const ResourceResponse&, const ShouldAddToBuffer&);

[Charlie Harrison, 2017/04/07 12:43:01]

ShouldAddtoBuffer does not need to be const.

+
   void notifyNavigationTimingToObservers();
 
   void addFirstPaintTiming(double startTime);
 
   void addFirstContentfulPaintTiming(double startTime);
 
   void mark(const String& markName, ExceptionState&);
   void clearMarks(const String& markName);
 
   void measure(const String& measureName,
@@ skipping 40 matching lines @@
 
   void notifyObserversOfEntry(PerformanceEntry&);
   bool hasObserverFor(PerformanceEntry::EntryType) const;
 
   void deliverObservationsTimerFired(TimerBase*);
 
   PerformanceEntryVector m_frameTimingBuffer;
   unsigned m_frameTimingBufferSize;
   PerformanceEntryVector m_resourceTimingBuffer;
   unsigned m_resourceTimingBufferSize;
+  PerformanceEntryVector m_serverTimingBuffer;
   Member<PerformanceEntry> m_navigationTiming;
   Member<UserTiming> m_userTiming;
 
   double m_timeOrigin;
 
   PerformanceEntryTypeMask m_observerFilterOptions;
   PerformanceObservers m_observers;
   PerformanceObservers m_activeObservers;
   PerformanceObservers m_suspendedObservers;
   TaskRunnerTimer<PerformanceBase> m_deliverObservationsTimer;
 };
 
 }  // namespace blink
 
 #endif  // PerformanceBase_h