Move paint-related timings out of DocumentTiming

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

+// 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.
+
+#ifndef PaintTiming_h
+#define PaintTiming_h
+
+#include "platform/Supplementable.h"
+#include "platform/heap/Handle.h"
+
+namespace blink {
+
+class Document;
+class LocalFrame;
+
+class PaintTiming final : public NoBaseWillBeGarbageCollectedFinalized<PaintTiming>, public WillBeHeapSupplement<Document> {
+    WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(PaintTiming);
+public:
+    virtual ~PaintTiming() { }
+
+    static PaintTiming& from(Document&);
+
+    void markFirstPaint();
+    void markFirstTextPaint();
+    void markFirstImagePaint();
+
+    // These return monotonically-increasing seconds.
+    double firstPaint() const { return m_firstPaint; }
+    double firstTextPaint() const { return m_firstTextPaint; }
+    double firstImagePaint() const { return m_firstImagePaint; }
+
+    DECLARE_VIRTUAL_TRACE();
+
+private:
+    explicit PaintTiming(Document&);
+    LocalFrame* frame() const;
+    void notifyPaintTimingChanged();
+
+    double m_firstPaint = 0.0;
+    double m_firstTextPaint = 0.0;
+    double m_firstImagePaint = 0.0;
+
+    RawPtrWillBeMember<Document> m_document;
+};
+
+}
+
+#endif