LongTaskTiming: add idl, Experiment flag, PerformanceEntry and basic implementation

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 54 matching lines @@
 
     // Reduce the resolution to 5µs to prevent timing attacks. See:
     // http://www.w3.org/TR/hr-time-2/#privacy-security
     static double clampTimeResolution(double timeSeconds);
 
     // Translate given platform monotonic time in seconds into a high resolution
     // DOMHighResTimeStamp in milliseconds. The result timestamp is relative to
     // document's time origin and has a time resolution that is safe for
     // exposing to web.
     DOMHighResTimeStamp monotonicTimeToDOMHighResTimeStamp(double) const;
+    double monotonicTimeToDOMHighResTimeStampInMillis(DOMHighResTimeStamp) const;
     DOMHighResTimeStamp now() const;
 
     double timeOrigin() const { return m_timeOrigin; }
 
     PerformanceEntryVector getEntries() const;
     PerformanceEntryVector getEntriesByType(const String& entryType);
     PerformanceEntryVector getEntriesByName(const String& name, const String& entryType);
 
     void clearResourceTimings();
     void setResourceTimingBufferSize(unsigned);
 
     DEFINE_ATTRIBUTE_EVENT_LISTENER(resourcetimingbufferfull);
     DEFINE_ATTRIBUTE_EVENT_LISTENER(webkitresourcetimingbufferfull);
 
     void clearFrameTimings();
     void setFrameTimingBufferSize(unsigned);
 
     DEFINE_ATTRIBUTE_EVENT_LISTENER(frametimingbufferfull);
 
+    void clearLongTaskTimings();
+    void setLongTaskTimingBufferSize(unsigned);
+
+    DEFINE_ATTRIBUTE_EVENT_LISTENER(longtasktimingbufferfull);
+
+    void addLongTaskTiming(double, double, String frameContextUrl);
+
     void addResourceTiming(const ResourceTimingInfo&);
 
     void addRenderTiming(Document*, unsigned, double, double);
 
     void addCompositeTiming(Document*, unsigned, double);
 
     void mark(const String& markName, ExceptionState&);
     void clearMarks(const String& markName);
 
     void measure(const String& measureName, const String& startMark, const String& endMark, ExceptionState&);
     void clearMeasures(const String& measureName);
 
     void unregisterPerformanceObserver(PerformanceObserver&);
     void registerPerformanceObserver(PerformanceObserver&);
     void updatePerformanceObserverFilterOptions();
     void activateObserver(PerformanceObserver&);
     void resumeSuspendedObservers();
 
     DECLARE_VIRTUAL_TRACE();
 
 protected:
     explicit PerformanceBase(double timeOrigin);
 
     bool isResourceTimingBufferFull();
     void addResourceTimingBuffer(PerformanceEntry&);
 
     bool isFrameTimingBufferFull();
     void addFrameTimingBuffer(PerformanceEntry&);
 
+    bool isLongTaskTimingBufferFull();
+    void addLongTaskTimingBuffer(PerformanceEntry&);
+
     void notifyObserversOfEntry(PerformanceEntry&);
     bool hasObserverFor(PerformanceEntry::EntryType);
 
     void deliverObservationsTimerFired(TimerBase*);
 
     PerformanceEntryVector m_frameTimingBuffer;
     unsigned m_frameTimingBufferSize;
     PerformanceEntryVector m_resourceTimingBuffer;
     unsigned m_resourceTimingBufferSize;
+    PerformanceEntryVector m_longTaskTimingBuffer;
+    unsigned m_longTaskTimingBufferSize;
+    Member<UserTiming> m_userTiming;
+
     double m_timeOrigin;
 
-    Member<UserTiming> m_userTiming;
-
     PerformanceEntryTypeMask m_observerFilterOptions;
     PerformanceObservers m_observers;
     PerformanceObservers m_activeObservers;
     PerformanceObservers m_suspendedObservers;
     Timer<PerformanceBase> m_deliverObservationsTimer;
 };
 
 } // namespace blink
 
 #endif // PerformanceBase_h