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diff --git a/chromium/third_party/blink/renderer/platform/scroll/scrollbar_theme_client.h b/chromium/third_party/blink/renderer/platform/scroll/scrollbar_theme_client.h
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+++ b/chromium/third_party/blink/renderer/platform/scroll/scrollbar_theme_client.h
@@ -0,0 +1,90 @@
+/*
+ * Copyright (C) 2012 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 APPLE 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 APPLE 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_PLATFORM_SCROLL_SCROLLBAR_THEME_CLIENT_H_
+#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_SCROLL_SCROLLBAR_THEME_CLIENT_H_
+
+#include "third_party/blink/renderer/platform/geometry/int_point.h"
+#include "third_party/blink/renderer/platform/geometry/int_rect.h"
+#include "third_party/blink/renderer/platform/geometry/int_size.h"
+#include "third_party/blink/renderer/platform/platform_export.h"
+#include "third_party/blink/renderer/platform/scroll/scroll_types.h"
+#include "third_party/blink/renderer/platform/wtf/vector.h"
+
+namespace blink {
+
+class PLATFORM_EXPORT ScrollbarThemeClient {
+ public:
+  virtual int X() const = 0;
+  virtual int Y() const = 0;
+  virtual int Width() const = 0;
+  virtual int Height() const = 0;
+  virtual IntSize Size() const = 0;
+  virtual IntPoint Location() const = 0;
+
+  virtual void SetFrameRect(const IntRect&) = 0;
+  virtual IntRect FrameRect() const = 0;
+
+  virtual void Invalidate() = 0;
+  virtual void InvalidateRect(const IntRect&) = 0;
+
+  virtual ScrollbarOverlayColorTheme GetScrollbarOverlayColorTheme() const = 0;
+  virtual void GetTickmarks(Vector<IntRect>&) const = 0;
+  virtual bool IsScrollableAreaActive() const = 0;
+
+  virtual IntPoint ConvertFromRootFrame(const IntPoint&) const = 0;
+
+  virtual bool IsCustomScrollbar() const = 0;
+  virtual ScrollbarOrientation Orientation() const = 0;
+  virtual bool IsLeftSideVerticalScrollbar() const = 0;
+
+  virtual int Value() const = 0;
+  virtual float CurrentPos() const = 0;
+  virtual int VisibleSize() const = 0;
+  virtual int TotalSize() const = 0;
+  virtual int Maximum() const = 0;
+  virtual ScrollbarControlSize GetControlSize() const = 0;
+
+  virtual ScrollbarPart PressedPart() const = 0;
+  virtual ScrollbarPart HoveredPart() const = 0;
+
+  virtual void StyleChanged() = 0;
+  virtual void SetScrollbarsHiddenIfOverlay(bool) = 0;
+
+  virtual bool Enabled() const = 0;
+  virtual void SetEnabled(bool) = 0;
+
+  virtual bool IsOverlayScrollbar() const = 0;
+
+  virtual float ElasticOverscroll() const = 0;
+  virtual void SetElasticOverscroll(float) = 0;
+
+ protected:
+  virtual ~ScrollbarThemeClient() = default;
+};
+
+}  // namespace blink
+
+#endif  // ScollbarThemeClient_h