POC for InspectorInstrumentation adding InspectorWebPerfAgent

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

Index: third_party/WebKit/Source/core/timing/PerformanceBase.h
diff --git a/third_party/WebKit/Source/core/timing/PerformanceBase.h b/third_party/WebKit/Source/core/timing/PerformanceBase.h
index a63d7b9cb9567c599607dfee4a02d54000dc082b..4d93ea601a7033a1f8e3f7a683966d450c7e4fc6 100644
--- a/third_party/WebKit/Source/core/timing/PerformanceBase.h
+++ b/third_party/WebKit/Source/core/timing/PerformanceBase.h
@@ -63,6 +63,8 @@ public:
 
     virtual PerformanceTiming* timing() const;
 
+    virtual void enableInspectorInstrumentation() const;
+
     // 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);
@@ -109,6 +111,9 @@ public:
     void activateObserver(PerformanceObserver&);
     void resumeSuspendedObservers();
 
+    // Needed by PerformanceObserver. Make Friend class?
+    bool hasObserverFor(PerformanceEntry::EntryType);
+
     DECLARE_VIRTUAL_TRACE();
 
 protected:
@@ -121,7 +126,6 @@ protected:
     void addFrameTimingBuffer(PerformanceEntry&);
 
     void notifyObserversOfEntry(PerformanceEntry&);
-    bool hasObserverFor(PerformanceEntry::EntryType);
 
     void deliverObservationsTimerFired(TimerBase*);
 
@@ -138,6 +142,7 @@ protected:
     PerformanceObservers m_activeObservers;
     PerformanceObservers m_suspendedObservers;
     Timer<PerformanceBase> m_deliverObservationsTimer;
+    bool m_inspectorInstrumentationEnabled;
 };
 
 } // namespace blink