Button elements are clipping overflow by default

Source/core/layout/LayoutButton.h

Index: Source/core/layout/LayoutButton.h
diff --git a/Source/core/layout/LayoutButton.h b/Source/core/layout/LayoutButton.h
index 517dc2427d3efb3fc35e5a8956b0d95d670be2d6..28d34cce8d55e4e58531f65f66fba59675206ee6 100644
--- a/Source/core/layout/LayoutButton.h
+++ b/Source/core/layout/LayoutButton.h
@@ -46,7 +46,7 @@ public:
     virtual bool createsAnonymousWrapper() const override { return true; }
 
     virtual bool canHaveGeneratedChildren() const override;
-    virtual bool hasControlClip() const override { return true; }
+    virtual bool hasControlClip() const override { return !isHTMLButtonElement(node()); }

[leviw_travelin_and_unemployed, 2015/03/17 10:18:34]

Can you put the implementation in LayoutButton.cpp (we can't inline virtual
functions anyways) and add a comment?

     virtual LayoutRect controlClipRect(const LayoutPoint&) const override;
 
     virtual int baselinePosition(FontBaseline, bool firstLine, LineDirectionMode, LinePositionMode) const override;