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diff --git a/Source/WebCore/platform/Theme.h b/Source/WebCore/platform/Theme.h
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+/*
+ * Copyright (C) 2008 Apple 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 INC. ``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 INC. OR
+ * 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 Theme_h
+#define Theme_h
+
+#include "Color.h"
+#include "ControlStates.h"
+#include "FontCascade.h"
+#include "GraphicsTypes.h"
+#include "IntRect.h"
+#include "LengthBox.h"
+#include "LengthSize.h"
+#include "ThemeTypes.h"
+#include <wtf/Forward.h>
+#include <wtf/Optional.h>
+
+namespace WebCore {
+
+class GraphicsContext;
+class ScrollView;
+
+// Unlike other platform classes, Theme does extensively use virtual functions.  This design allows a platform to switch between multiple themes at runtime.
+class Theme {
+public:
+    Theme() { }
+    virtual ~Theme() { }
+
+    // A method to obtain the baseline position adjustment for a "leaf" control.  This will only be used if a baseline
+    // position cannot be determined by examining child content. Checkboxes and radio buttons are examples of
+    // controls that need to do this.  The adjustment is an offset that adds to the baseline, e.g., marginTop() + height() + |offset|.
+    // The offset is not zoomed.
+    virtual int baselinePositionAdjustment(ControlPart) const { return 0; }
+
+    // A method asking if the control changes its appearance when the window is inactive.
+    virtual bool controlHasInactiveAppearance(ControlPart) const { return false; }
+    
+    // General methods for whether or not any of the controls in the theme change appearance when the window is inactive or
+    // when hovered over.
+    virtual bool controlsCanHaveInactiveAppearance() const { return false; }
+    virtual bool controlsCanHaveHoveredAppearance() const { return false; }
+
+    // Used by RenderTheme::isControlStyled to figure out if the native look and feel should be turned off.
+    virtual bool controlDrawsBorder(ControlPart) const { return true; }
+    virtual bool controlDrawsBackground(ControlPart) const { return true; }
+    virtual bool controlDrawsFocusOutline(ControlPart) const { return true; }
+
+    // Methods for obtaining platform-specific colors.
+    virtual Color selectionColor(ControlPart, const ControlStates&, SelectionPart) const { return Color(); }
+    virtual Color textSearchHighlightColor() const { return Color(); }
+    
+    // CSS system colors and fonts
+    virtual Color systemColor(ThemeColor) const { return Color(); }
+    virtual FontCascade systemFont(ThemeFont, FontDescription&) const { return FontCascade(); }
+    
+    // How fast the caret blinks in text fields.
+    virtual double caretBlinkInterval() const { return 0.5; }
+
+    // Notification when the theme has changed
+    virtual void themeChanged() { }
+
+    // Methods used to adjust the RenderStyles of controls.
+    
+    // The font description result should have a zoomed font size.
+    virtual std::optional<FontCascadeDescription> controlFont(ControlPart, const FontCascade&, float /*zoomFactor*/) const { return std::nullopt; }
+    
+    // The size here is in zoomed coordinates already. If a new size is returned, it also needs to be in zoomed coordinates.
+    virtual LengthSize controlSize(ControlPart, const FontCascade&, const LengthSize& zoomedSize, float /*zoomFactor*/) const { return zoomedSize; }
+    
+    // Returns the minimum size for a control in zoomed coordinates.  
+    virtual LengthSize minimumControlSize(ControlPart, const FontCascade&, float /*zoomFactor*/) const { return { { 0, Fixed }, { 0, Fixed } }; }
+    
+    // Allows the theme to modify the existing padding/border.
+    virtual LengthBox controlPadding(ControlPart, const FontCascade&, const LengthBox& zoomedBox, float zoomFactor) const;
+    virtual LengthBox controlBorder(ControlPart, const FontCascade&, const LengthBox& zoomedBox, float zoomFactor) const;
+    
+    // Whether or not whitespace: pre should be forced on always.
+    virtual bool controlRequiresPreWhiteSpace(ControlPart) const { return false; }
+
+    // Method for painting a control. The rect is in zoomed coordinates.
+    virtual void paint(ControlPart, ControlStates&, GraphicsContext&, const FloatRect& /*zoomedRect*/, float /*zoomFactor*/, ScrollView*, float /*deviceScaleFactor*/, float /*pageScaleFactor*/) { }
+
+    // Some controls may spill out of their containers (e.g., the check on an OS X checkbox).  When these controls repaint,
+    // the theme needs to communicate this inflated rect to the engine so that it can invalidate the whole control.
+    // The rect passed in is in zoomed coordinates, so the inflation should take that into account and make sure the inflation
+    // amount is also scaled by the zoomFactor.
+    virtual void inflateControlPaintRect(ControlPart, const ControlStates&, FloatRect& /*zoomedRect*/, float /*zoomFactor*/) const { }
+
+    virtual void drawNamedImage(const String&, GraphicsContext&, const FloatRect&) const;
+
+    virtual bool userPrefersReducedMotion() const { return false; }
+
+    // This method is called once, from RenderTheme::adjustDefaultStyleSheet(), to let each platform adjust
+    // the default CSS rules in html.css.
+    static String defaultStyleSheet();
+
+private:
+    mutable Color m_activeSelectionColor;
+    mutable Color m_inactiveSelectionColor;
+};
+
+// Function to obtain the theme.  This is implemented in the platform-specific subclasses.
+Theme* platformTheme();
+
+} // namespace WebCore
+
+#endif // Theme_h