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 start_time,
                          double end_time,
                          const String& name,
                          const String& culprit_frame_src,
                          const String& culprit_frame_id,
                          const String& culprit_frame_name);
 
   void AddResourceTiming(const ResourceTimingInfo&);
 
+  enum class ShouldAddToBuffer {
+    Always,
+    Never,
+  };
+  void AddServerTiming(const ResourceResponse&, ShouldAddToBuffer);
+
   void NotifyNavigationTimingToObservers();
 
   void AddFirstPaintTiming(double start_time);
 
   void AddFirstContentfulPaintTiming(double start_time);
 
   void mark(const String& mark_name, ExceptionState&);
   void clearMarks(const String& mark_name);
 
   void measure(const String& measure_name,
@@ skipping 32 matching lines @@
     return nullptr;
   }
 
   bool IsResourceTimingBufferFull();
   void AddResourceTimingBuffer(PerformanceEntry&);
 
   bool IsFrameTimingBufferFull();
   void AddFrameTimingBuffer(PerformanceEntry&);
 
   void NotifyObserversOfEntry(PerformanceEntry&);
+  void NotifyObserversOfEntries(PerformanceEntryVector&);
   bool HasObserverFor(PerformanceEntry::EntryType) const;
 
   void DeliverObservationsTimerFired(TimerBase*);
 
   PerformanceEntryVector frame_timing_buffer_;
   unsigned frame_timing_buffer_size_;
   PerformanceEntryVector resource_timing_buffer_;
   unsigned resource_timing_buffer_size_;
+  PerformanceEntryVector server_timing_buffer_;
   Member<PerformanceEntry> navigation_timing_;
   Member<UserTiming> user_timing_;
 
   double time_origin_;
 
   PerformanceEntryTypeMask observer_filter_options_;
   PerformanceObservers observers_;
   PerformanceObservers active_observers_;
   PerformanceObservers suspended_observers_;
   TaskRunnerTimer<PerformanceBase> deliver_observations_timer_;
 };
 
 }  // namespace blink
 
 #endif  // PerformanceBase_h