first-paint and first-contentful paint

third_party/WebKit/Source/core/timing/PerformanceBase.cpp

Index: third_party/WebKit/Source/core/timing/PerformanceBase.cpp
diff --git a/third_party/WebKit/Source/core/timing/PerformanceBase.cpp b/third_party/WebKit/Source/core/timing/PerformanceBase.cpp
index 39a7e3029048b737b9dd46be61be55e16c9c23ef..1ccf42e63c9f46114f3bd53a73da62bc77ffb24b 100644
--- a/third_party/WebKit/Source/core/timing/PerformanceBase.cpp
+++ b/third_party/WebKit/Source/core/timing/PerformanceBase.cpp
@@ -124,9 +124,14 @@ PerformanceEntryVector PerformanceBase::getEntriesByType(
   switch (type) {
     case PerformanceEntry::Invalid:
       return entries;
+    case PerformanceEntry::Paint:
+    // Unsupported for Paint. Per the spec, Paint entries
+    // can only be accessed via Performance Observer.
+    // No separate buffer is maintained.
     case PerformanceEntry::LongTask:
-      // Unsupported for LongTask. Per the spec, Long task entries can only be
-      // accessed via Performance Observer. No separate buffer is maintained.
+      // Unsupported for LongTask. Per the spec, Long task entries
+      // can only be accessed via Performance Observer.
+      // No separate buffer is maintained.
       return entries;
     case PerformanceEntry::Resource:
       for (const auto& resource : m_resourceTimingBuffer)
@@ -377,6 +382,24 @@ void PerformanceBase::addNavigationTiming(LocalFrame* frame) {
   notifyObserversOfEntry(*m_navigationTiming);
 }
 
+void PerformanceBase::addFirstPaintTiming(double startTime) {
+  addPaintTiming(PerformancePaintTiming::PaintType::FirstPaint, startTime);
+}
+
+void PerformanceBase::addFirstContentfulPaintTiming(double startTime) {
+  addPaintTiming(PerformancePaintTiming::PaintType::FirstContentfulPaint,
+                 startTime);
+}
+
+void PerformanceBase::addPaintTiming(PerformancePaintTiming::PaintType type,
+                                     double startTime) {
+  if (!RuntimeEnabledFeatures::performancePaintTimingEnabled())
+    return;
+  PerformanceEntry* entry = new PerformancePaintTiming(
+      type, monotonicTimeToDOMHighResTimeStamp(startTime));
+  notifyObserversOfEntry(*entry);
+}
+
 void PerformanceBase::addResourceTimingBuffer(PerformanceEntry& entry) {
   m_resourceTimingBuffer.append(&entry);