first-paint and first-contentful paint

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 3bbee2edb770f543264ff4152219cc1c445af1ae..56111394829c7fd9cf900a75a37a2f0e24cf815c 100644
--- a/third_party/WebKit/Source/core/timing/PerformanceBase.h
+++ b/third_party/WebKit/Source/core/timing/PerformanceBase.h
@@ -36,6 +36,7 @@
 #include "core/dom/DOMHighResTimeStamp.h"
 #include "core/events/EventTarget.h"
 #include "core/timing/PerformanceEntry.h"
+#include "core/timing/PerformancePaintTiming.h"
 #include "platform/Timer.h"
 #include "platform/heap/Handle.h"
 #include "wtf/Forward.h"
@@ -54,6 +55,8 @@ class ResourceTimingInfo;
 class UserTiming;
 
 using PerformanceEntryVector = HeapVector<Member<PerformanceEntry>>;
+using PerformancePaintTimingEntries =
+    HeapHashMap<String, Member<PerformanceEntry>>;
 using PerformanceObservers = HeapListHashSet<Member<PerformanceObserver>>;
 
 class CORE_EXPORT PerformanceBase : public EventTargetWithInlineData {
@@ -107,6 +110,10 @@ class CORE_EXPORT PerformanceBase : public EventTargetWithInlineData {
 
   void addNavigationTiming(LocalFrame*);
 
+  void addPaintTiming(PerformancePaintTiming::PaintType, double startTime);
+
+  void clearPaintTimingBuffer();
+
   void mark(const String& markName, ExceptionState&);
   void clearMarks(const String& markName);
 
@@ -143,6 +150,7 @@ class CORE_EXPORT PerformanceBase : public EventTargetWithInlineData {
   PerformanceEntryVector m_resourceTimingBuffer;
   unsigned m_resourceTimingBufferSize;
   Member<PerformanceEntry> m_navigationTiming;
+  PerformancePaintTimingEntries m_paintTimingBuffer;

[panicker, 2016/11/29 22:21:15]

This is not supposed to be buffer-able yet due to a spec limitation.
Let's remove the buffer, and could add it back in the future when the spec
supports it.
(This simplifies the implementation a lot)

[sunjian, 2016/12/02 21:39:57]

Done.

   Member<UserTiming> m_userTiming;
 
   double m_timeOrigin;