1 files changed, 50 insertions, 0 deletions
diff --git a/dom/performance/PerformancePaintTiming.h b/dom/performance/PerformancePaintTiming.h
new file mode 100644
index 0000000000..395866dbc2
--- /dev/null
+++ b/dom/performance/PerformancePaintTiming.h
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+/* -*- 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/. */
+
+#ifndef mozilla_dom_PerformancePaintTiming_h___
+#define mozilla_dom_PerformancePaintTiming_h___
+
+#include "mozilla/dom/PerformanceEntry.h"
+#include "mozilla/dom/PerformancePaintTimingBinding.h"
+
+namespace mozilla::dom {
+
+class Performance;
+
+// https://w3c.github.io/paint-timing/#sec-PerformancePaintTiming
+// Unlike timeToContentfulPaint, this timing is generated during
+// displaylist building, when a frame is contentful, we collect
+// the timestamp. Whereas, timeToContentfulPaint uses a compositor-side
+// timestamp.
+class PerformancePaintTiming final : public PerformanceEntry {
+ public:
+  PerformancePaintTiming(Performance* aPerformance, const nsAString& aName,
+                         const TimeStamp& aStartTime);
+
+  NS_DECL_ISUPPORTS_INHERITED
+
+  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(PerformancePaintTiming,
+                                           PerformanceEntry)
+
+  JSObject* WrapObject(JSContext* aCx,
+                       JS::Handle<JSObject*> aGivenProto) override;
+
+  DOMHighResTimeStamp StartTime() const override;
+
+  size_t SizeOfIncludingThis(
+      mozilla::MallocSizeOf aMallocSizeOf) const override;
+
+ private:
+  ~PerformancePaintTiming();
+  RefPtr<Performance> mPerformance;
+
+  const TimeStamp mRawStartTime;
+  mutable Maybe<DOMHighResTimeStamp> mCachedStartTime;
+};
+
+}  // namespace mozilla::dom
+
+#endif /* mozilla_dom_PerformanacePaintTiming_h___ */