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diff --git a/chromium/third_party/blink/renderer/core/frame/frame_overlay.h b/chromium/third_party/blink/renderer/core/frame/frame_overlay.h
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+/*
+ * Copyright (C) 2011 Google Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY GOOGLE INC. AND ITS CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GOOGLE INC.
+ * OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_FRAME_FRAME_OVERLAY_H_
+#define THIRD_PARTY_BLINK_RENDERER_CORE_FRAME_FRAME_OVERLAY_H_
+
+#include <memory>
+#include "third_party/blink/renderer/core/core_export.h"
+#include "third_party/blink/renderer/platform/graphics/graphics_layer.h"
+#include "third_party/blink/renderer/platform/graphics/graphics_layer_client.h"
+#include "third_party/blink/renderer/platform/graphics/paint/display_item_client.h"
+#include "third_party/blink/renderer/platform/wtf/text/wtf_string.h"
+
+namespace blink {
+
+class GraphicsContext;
+class LocalFrame;
+
+// Manages a layer that is overlaid on a WebLocalFrame's content.
+class CORE_EXPORT FrameOverlay : public GraphicsLayerClient,
+                                 public DisplayItemClient {
+ public:
+  class Delegate {
+   public:
+    virtual ~Delegate() = default;
+
+    // Paints page overlay contents.
+    virtual void PaintFrameOverlay(const FrameOverlay&,
+                                   GraphicsContext&,
+                                   const IntSize& view_size) const = 0;
+    // For CompositeAfterPaint. Invalidates composited layers managed by the
+    // delegate if any.
+    virtual void Invalidate() {}
+  };
+
+  static std::unique_ptr<FrameOverlay> Create(
+      LocalFrame*,
+      std::unique_ptr<FrameOverlay::Delegate>);
+
+  ~FrameOverlay() override;
+
+  void Update();
+
+  // For CompositeAfterPaint.
+  void Paint(GraphicsContext&);
+
+  GraphicsLayer* GetGraphicsLayer() const {
+    DCHECK(!RuntimeEnabledFeatures::CompositeAfterPaintEnabled());
+    return layer_.get();
+  }
+
+  // FrameOverlay is always the same size as the viewport.
+  IntSize Size() const;
+
+  // Ensure that |layer_| is attached to the root graphics layer. Updates
+  // to the frames compositing may remove the graphics layer at any
+  // point. This should be called before calling PaintContents.
+  void EnsureOverlayAttached() const;
+
+  const Delegate* GetDelegate() const { return delegate_.get(); }
+  const LocalFrame& Frame() const { return *frame_; }
+
+  // DisplayItemClient methods.
+  String DebugName() const final { return "FrameOverlay"; }
+  LayoutRect VisualRect() const override;
+
+  // GraphicsLayerClient implementation. Not needed for CompositeAfterPaint.
+  bool NeedsRepaint(const GraphicsLayer&) const override { return true; }
+  IntRect ComputeInterestRect(const GraphicsLayer*,
+                              const IntRect&) const override;
+  void PaintContents(const GraphicsLayer*,
+                     GraphicsContext&,
+                     GraphicsLayerPaintingPhase,
+                     const IntRect& interest_rect) const override;
+  String DebugName(const GraphicsLayer*) const override;
+
+ private:
+  FrameOverlay(LocalFrame*, std::unique_ptr<FrameOverlay::Delegate>);
+
+  Persistent<LocalFrame> frame_;
+  std::unique_ptr<FrameOverlay::Delegate> delegate_;
+  std::unique_ptr<GraphicsLayer> layer_;
+};
+
+}  // namespace blink
+
+#endif  // THIRD_PARTY_BLINK_RENDERER_CORE_PAGE_PAGE_OVERLAY_H_