first-paint and first-contentful paint

third_party/WebKit/Source/core/paint/PaintTiming.cpp

Index: third_party/WebKit/Source/core/paint/PaintTiming.cpp
diff --git a/third_party/WebKit/Source/core/paint/PaintTiming.cpp b/third_party/WebKit/Source/core/paint/PaintTiming.cpp
index b5964500258f47b528af52a1acbf486c6e3e5453..34185f974d7d10140a15d5e2dc6cc37ccb2b4230 100644
--- a/third_party/WebKit/Source/core/paint/PaintTiming.cpp
+++ b/third_party/WebKit/Source/core/paint/PaintTiming.cpp
@@ -6,13 +6,29 @@
 
 #include "core/dom/Document.h"
 #include "core/frame/FrameView.h"
+#include "core/frame/LocalDOMWindow.h"
 #include "core/frame/LocalFrame.h"
 #include "core/loader/DocumentLoader.h"
+#include "core/timing/DOMWindowPerformance.h"
+#include "core/timing/Performance.h"
 #include "platform/tracing/TraceEvent.h"
 #include "public/platform/WebFrameScheduler.h"
 
 namespace blink {
 
+namespace {
+
+Performance* getPerformanceInstance(LocalFrame* frame) {
+  Performance* performance = nullptr;
+  if (frame) {
+    performance = DOMWindowPerformance::performance(*frame->localDOMWindow());

[haraken, 2016/12/09 00:30:03]

frame->localDOMWindow() may return null. Check it.

[sunjian, 2016/12/09 19:06:49]

Done.

+    DCHECK(performance);
+  }
+  return performance;
+}
+
+}  // namespace
+
 static const char kSupplementName[] = "PaintTiming";
 
 PaintTiming& PaintTiming::from(Document& document) {
@@ -122,6 +138,10 @@ void PaintTiming::setFirstPaint(double stamp) {
   if (m_firstPaint != 0.0)
     return;
   m_firstPaint = stamp;
+  Performance* performance = getPerformanceInstance(frame());
+  if (performance)
+    performance->addFirstPaintTiming(m_firstPaint);
+
   TRACE_EVENT_INSTANT1("blink.user_timing,rail", "firstPaint",
                        TRACE_EVENT_SCOPE_PROCESS, "frame", frame());
 }
@@ -131,6 +151,9 @@ void PaintTiming::setFirstContentfulPaint(double stamp) {
     return;
   setFirstPaint(stamp);
   m_firstContentfulPaint = stamp;
+  Performance* performance = getPerformanceInstance(frame());
+  if (performance)
+    performance->addFirstContentfulPaintTiming(m_firstContentfulPaint);
   TRACE_EVENT_INSTANT1("blink.user_timing,rail", "firstContentfulPaint",
                        TRACE_EVENT_SCOPE_PROCESS, "frame", frame());
 }