| Index: third_party/WebKit/Source/core/page/ChromeClient.h
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| diff --git a/third_party/WebKit/Source/core/page/ChromeClient.h b/third_party/WebKit/Source/core/page/ChromeClient.h
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| index 762d7844a784f046c7bdad2895f671c6c6d7b628..5f310e426fadea4c0e35e411b8e72b7fd8da28a3 100644
 | 
| --- a/third_party/WebKit/Source/core/page/ChromeClient.h
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| +++ b/third_party/WebKit/Source/core/page/ChromeClient.h
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| @@ -169,6 +169,7 @@ public:
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|      virtual void contentsSizeChanged(LocalFrame*, const IntSize&) const = 0;
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|      virtual void pageScaleFactorChanged() const { }
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|      virtual float clampPageScaleFactorToLimits(float scale) const { return scale; }
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| +    virtual void mainFrameScrollOffsetChanged() const {}
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|      virtual void layoutUpdated(LocalFrame*) const { }
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|  
 | 
|      void mouseDidMoveOverElement(const HitTestResult&);
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| 
 |