Fix mouse wheel scrolling on PDFs.

third_party/WebKit/Source/web/WebSettingsImpl.h

 /*
  * Copyright (C) 2009 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 173 matching lines @@
     void setV8CacheOptions(V8CacheOptions) override;
     void setValidationMessageTimerMagnification(int) override;
     void setViewportEnabled(bool) override;
     void setViewportMetaEnabled(bool) override;
     void setViewportMetaLayoutSizeQuirk(bool) override;
     void setViewportMetaMergeContentQuirk(bool) override;
     void setViewportMetaNonUserScalableQuirk(bool) override;
     void setViewportMetaZeroValuesQuirk(bool) override;
     void setWebGLErrorsToConsoleEnabled(bool) override;
     void setWebSecurityEnabled(bool) override;
+    void setWheelGesturesEnabled(bool) override;
     void setWideViewportQuirkEnabled(bool) override;
     void setXSSAuditorEnabled(bool) override;
 
     bool showFPSCounter() const { return m_showFPSCounter; }
     bool showPaintRects() const { return m_showPaintRects; }
     bool renderVSyncNotificationEnabled() const { return m_renderVSyncNotificationEnabled; }
     bool autoZoomFocusedNodeToLegibleScale() const { return m_autoZoomFocusedNodeToLegibleScale; }
     bool doubleTapToZoomEnabled() const;
     bool perTilePaintingEnabled() const { return m_perTilePaintingEnabled; }
     bool supportDeprecatedTargetDensityDPI() const { return m_supportDeprecatedTargetDensityDPI; }
     bool viewportMetaEnabled() const;
     bool viewportMetaLayoutSizeQuirk() const { return m_viewportMetaLayoutSizeQuirk; }
     bool viewportMetaNonUserScalableQuirk() const { return m_viewportMetaNonUserScalableQuirk; }
     bool clobberUserAgentInitialScaleQuirk() const { return m_clobberUserAgentInitialScaleQuirk; }
 
     void setMockGestureTapHighlightsEnabled(bool);
     bool mockGestureTapHighlightsEnabled() const;
+    bool wheelGesturesEnabled() const;
 
 private:
     Settings* m_settings;
     RawPtrWillBeUntracedMember<DevToolsEmulator> m_devToolsEmulator;
     bool m_showFPSCounter;
     bool m_showPaintRects;
     bool m_renderVSyncNotificationEnabled;
     bool m_autoZoomFocusedNodeToLegibleScale;
     bool m_perTilePaintingEnabled;
     bool m_supportDeprecatedTargetDensityDPI;
     bool m_shrinksViewportContentToFit;
     // This quirk is to maintain compatibility with Android apps built on
     // the Android SDK prior to and including version 18. Presumably, this
     // can be removed any time after 2015. See http://crbug.com/277369.
     bool m_viewportMetaLayoutSizeQuirk;
     // This quirk is to maintain compatibility with Android apps built on
     // the Android SDK prior to and including version 18. Presumably, this
     // can be removed any time after 2015. See http://crbug.com/312691.
     bool m_viewportMetaNonUserScalableQuirk;
     // This quirk is to maintain compatibility with Android apps built on
     // the Android SDK prior to and including version 18. Presumably, this
     // can be removed any time after 2015. See http://crbug.com/313754.
     bool m_clobberUserAgentInitialScaleQuirk;
 };
 
 } // namespace blink
 
 #endif