Notify paint for each frame

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

+// Copyright 2017 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 FramePaintTiming_h
+#define FramePaintTiming_h
+
+#include "core/frame/LocalFrame.h"
+#include "core/paint/PaintTiming.h"
+#include "platform/graphics/GraphicsContext.h"
+#include "platform/graphics/paint/PaintController.h"
+#include "platform/heap/Handle.h"
+
+namespace blink {
+
+class FramePaintTiming {
+  STACK_ALLOCATED();
+  WTF_MAKE_NONCOPYABLE(FramePaintTiming);
+
+ public:
+  FramePaintTiming(GraphicsContext& context, const LocalFrame* frame)
+      : context_(context), frame_(frame) {
+    context_.GetPaintController().BeginFrame(frame_);
+  }
+
+  ~FramePaintTiming() {
+    DCHECK(frame_->GetDocument());
+    FrameFirstPaint result = context_.GetPaintController().EndFrame(frame_);
+    PaintTiming::From(*frame_->GetDocument())
+        .NotifyPaint(result.first_painted, result.text_painted,
+                     result.image_painted);
+  }
+
+ private:
+  GraphicsContext& context_;
+  Member<const LocalFrame> frame_;
+};
+
+}  // namespace blink
+
+#endif  // FramePaintTiming_h