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/LocalDOMWindow.h"
 #include "core/loader/DocumentLoader.h"
+#include "core/timing/DOMWindowPerformance.h"
+#include "core/timing/Performance.h"
+#include "core/timing/PerformancePaintTiming.h"

[panicker, 2016/12/05 20:51:23]

would be nice to avoid this dep directly on PerformancePaintTiming.
maybe add 2 methods: addFirstPaintTiming & addFirstContentfulPaintTiming in
PerformanceBase, and then map to the enum there.

[sunjian, 2016/12/07 21:55:43]

Done.

 #include "platform/tracing/TraceEvent.h"
 
 namespace blink {
 
 static const char kSupplementName[] = "PaintTiming";
 
 PaintTiming& PaintTiming::from(Document& document) {
   PaintTiming* timing = static_cast<PaintTiming*>(
       Supplement<Document>::from(document, kSupplementName));
   if (!timing) {
@@ skipping 79 matching lines @@
 
 LocalFrame* PaintTiming::frame() const {
   return m_document ? m_document->frame() : nullptr;
 }
 
 void PaintTiming::notifyPaintTimingChanged() {
   if (m_document && m_document->loader())
     m_document->loader()->didChangePerformanceTiming();
 }
 
+void PaintTiming::addPaintTimingToPerformance(
+    PerformancePaintTiming::PaintType type,
+    double stamp) const {
+  if (frame()) {
+    Performance* performance =
+        DOMWindowPerformance::performance(*frame()->localDOMWindow());
+    DCHECK(performance);
+    performance->addPaintTiming(type, stamp);
+  }
+}
+
 void PaintTiming::setFirstPaint(double stamp) {
   if (m_firstPaint != 0.0)
     return;
   m_firstPaint = stamp;
+  addPaintTimingToPerformance(PerformancePaintTiming::PaintType::FirstPaint,
+                              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;
+  addPaintTimingToPerformance(
+      PerformancePaintTiming::PaintType::FirstContentfulPaint,
+      m_firstContentfulPaint);
   TRACE_EVENT_INSTANT1("blink.user_timing,rail", "firstContentfulPaint",
                        TRACE_EVENT_SCOPE_PROCESS, "frame", frame());
 }
 
 }  // namespace blink