First version of PerformanceObserver

Source/core/timing/PerformanceBase.h

Index: Source/core/timing/PerformanceBase.h
diff --git a/Source/core/timing/PerformanceBase.h b/Source/core/timing/PerformanceBase.h
index 344ee39bd06f292308b24db49d8b58f9d2d4ff84..08a54f28f43f3d7b7ef555c2f212f5bf4f907b7a 100644
--- a/Source/core/timing/PerformanceBase.h
+++ b/Source/core/timing/PerformanceBase.h
@@ -44,11 +44,13 @@ namespace blink {
 
 class Document;
 class ExceptionState;
+class PerformanceObserver;
 class PerformanceTiming;
 class ResourceTimingInfo;
 class UserTiming;
 
 using PerformanceEntryVector = HeapVector<Member<PerformanceEntry>>;
+using PerformanceObservers = HeapListHashSet<Member<PerformanceObserver>>;
 
 class CORE_EXPORT PerformanceBase : public RefCountedGarbageCollectedEventTargetWithInlineData<PerformanceBase> {
     REFCOUNTED_GARBAGE_COLLECTED_EVENT_TARGET(PerformanceBase);
@@ -88,9 +90,13 @@ public:
     void measure(const String& measureName, const String& startMark, const String& endMark, ExceptionState&);
     void clearMeasures(const String& measureName);
 
+    void unregisterPerformanceObserver(PerformanceObserver*);

[esprehn, 2015/07/24 08:23:12]

These should all take references.

[MikeB, 2015/07/24 19:30:38]

Done.

+    void registerPerformanceObserver(PerformanceObserver*);
+
     DECLARE_VIRTUAL_TRACE();
 
 protected:
+
     explicit PerformanceBase(double timeOrigin);
     bool isResourceTimingBufferFull();
     void addResourceTimingBuffer(PerformanceEntry*);
@@ -98,6 +104,9 @@ protected:
     bool isFrameTimingBufferFull();
     void addFrameTimingBuffer(PerformanceEntry*);
 
+    void notifyObserversOfEntry(PerformanceEntry*);

[esprehn, 2015/07/24 08:23:12]

ditto

[MikeB, 2015/07/24 19:30:38]

Done.

+    bool hasObserverFor(PerformanceEntry::EntryType);
+
     PerformanceEntryVector m_frameTimingBuffer;
     unsigned m_frameTimingBufferSize;
     PerformanceEntryVector m_resourceTimingBuffer;
@@ -105,6 +114,9 @@ protected:
     double m_timeOrigin;
 
     Member<UserTiming> m_userTiming;
+
+    PerformanceEntryType_t m_observerFilterOptions;

[esprehn, 2015/07/24 08:23:12]

Remove _t, we don't use that naming in blink.

[MikeB, 2015/07/24 19:30:38]

Done.

+    PerformanceObservers m_observers;
 };
 
 } // namespace blink