1 files changed, 52 insertions, 0 deletions
diff --git a/dom/performance/PerformancePaintTiming.cpp b/dom/performance/PerformancePaintTiming.cpp
new file mode 100644
index 0000000000..83eed06565
--- /dev/null
+++ b/dom/performance/PerformancePaintTiming.cpp
@@ -0,0 +1,52 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "PerformancePaintTiming.h"
+#include "Performance.h"
+#include "MainThreadUtils.h"
+#include "mozilla/dom/PerformanceMeasureBinding.h"
+#include "nsRFPService.h"
+
+using namespace mozilla::dom;
+
+NS_IMPL_CYCLE_COLLECTION_INHERITED(PerformancePaintTiming, PerformanceEntry,
+                                   mPerformance)
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(PerformancePaintTiming)
+NS_INTERFACE_MAP_END_INHERITING(PerformanceEntry)
+
+NS_IMPL_ADDREF_INHERITED(PerformancePaintTiming, PerformanceEntry)
+NS_IMPL_RELEASE_INHERITED(PerformancePaintTiming, PerformanceEntry)
+
+PerformancePaintTiming::PerformancePaintTiming(Performance* aPerformance,
+                                               const nsAString& aName,
+                                               const TimeStamp& aStartTime)
+    : PerformanceEntry(aPerformance->GetParentObject(), aName, u"paint"_ns),
+      mPerformance(aPerformance),
+      mRawStartTime(aStartTime) {}
+
+PerformancePaintTiming::~PerformancePaintTiming() = default;
+
+JSObject* PerformancePaintTiming::WrapObject(
+    JSContext* aCx, JS::Handle<JSObject*> aGivenProto) {
+  return PerformancePaintTiming_Binding::Wrap(aCx, this, aGivenProto);
+}
+
+DOMHighResTimeStamp PerformancePaintTiming::StartTime() const {
+  if (mCachedStartTime.isNothing()) {
+    DOMHighResTimeStamp rawValue =
+        mPerformance->GetDOMTiming()->TimeStampToDOMHighRes(mRawStartTime);
+    mCachedStartTime.emplace(nsRFPService::ReduceTimePrecisionAsMSecs(
+        rawValue, mPerformance->GetRandomTimelineSeed(),
+        mPerformance->GetRTPCallerType()));
+  }
+  return mCachedStartTime.value();
+}
+
+size_t PerformancePaintTiming::SizeOfIncludingThis(
+    mozilla::MallocSizeOf aMallocSizeOf) const {
+  return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
+}