first-paint and first-contentful paint

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

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/paint/PaintTiming.h"
 
 #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) {
   PaintTiming* timing = static_cast<PaintTiming*>(
       Supplement<Document>::from(document, kSupplementName));
   if (!timing) {
     timing = new PaintTiming(document);
     Supplement<Document>::provideTo(document, kSupplementName, timing);
   }
   return *timing;
@@ skipping 89 matching lines @@
 
 void PaintTiming::notifyPaintTimingChanged() {
   if (m_document && m_document->loader())
     m_document->loader()->didChangePerformanceTiming();
 }
 
 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());
 }
 
 void PaintTiming::setFirstContentfulPaint(double stamp) {
   if (m_firstContentfulPaint != 0.0)
     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());
 }
 
 }  // namespace blink