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..2562162798eb6822a6b517fc1f7d76e7f5a5c829 100644
--- a/Source/core/timing/PerformanceBase.h
+++ b/Source/core/timing/PerformanceBase.h
@@ -32,6 +32,7 @@
 #ifndef PerformanceBase_h
 #define PerformanceBase_h
 
+#include "bindings/core/v8/V8PerformanceObserverCallback.h"
 #include "core/CoreExport.h"
 #include "core/events/EventTarget.h"
 #include "core/timing/PerformanceEntry.h"
@@ -44,11 +45,16 @@ namespace blink {
 
 class Document;
 class ExceptionState;
+class PerformanceObserver;
+class PerformanceObserverRegistration;
 class PerformanceTiming;
 class ResourceTimingInfo;
 class UserTiming;
 
 using PerformanceEntryVector = HeapVector<Member<PerformanceEntry>>;
+using PerformanceObserverRegistrationVector = HeapVector<Member<PerformanceObserverRegistration>>;
+using FilterTypeIndex = size_t;
+using PerformanceObserverRegistrations = HeapHashMap<FilterTypeIndex, PerformanceObserverRegistrationVector>;
 
 class CORE_EXPORT PerformanceBase : public RefCountedGarbageCollectedEventTargetWithInlineData<PerformanceBase> {
     REFCOUNTED_GARBAGE_COLLECTED_EVENT_TARGET(PerformanceBase);
@@ -88,9 +94,21 @@ public:
     void measure(const String& measureName, const String& startMark, const String& endMark, ExceptionState&);
     void clearMeasures(const String& measureName);
 
+    PerformanceObserver* createPerformanceObserver(PerformanceObserverCallback*);
+    void unregisterPerformanceObserver(PerformanceObserverRegistration*);
+    void registerPerformanceObserver(PerformanceObserverRegistration*);
+
     DECLARE_VIRTUAL_TRACE();
 
 protected:
+    enum FilterType {
+        Composite = 1,

[esprehn, 2015/07/18 22:24:16]

UnknownFilter, or maybe InvalidFilter
CompositeFilter,
...

[MikeB, 2015/07/20 23:06:50]

Done.

+        Mark,
+        Measure,
+        Render,
+        Resource,
+    };
+
     explicit PerformanceBase(double timeOrigin);
     bool isResourceTimingBufferFull();
     void addResourceTimingBuffer(PerformanceEntry*);
@@ -98,6 +116,9 @@ protected:
     bool isFrameTimingBufferFull();
     void addFrameTimingBuffer(PerformanceEntry*);
 
+    void notifyObserversOfEntry(FilterType, PerformanceEntry*);
+    bool hasObserverFor(FilterType);
+
     PerformanceEntryVector m_frameTimingBuffer;
     unsigned m_frameTimingBufferSize;
     PerformanceEntryVector m_resourceTimingBuffer;
@@ -105,6 +126,8 @@ protected:
     double m_timeOrigin;
 
     Member<UserTiming> m_userTiming;
+
+    PerformanceObserverRegistrations m_observerRegistry;
 };
 
 } // namespace blink