Add StyleChangeState to get rid of a bunch of static state in the render tree.

Source/WebCore/rendering/RenderButton.cpp

Index: Source/WebCore/rendering/RenderButton.cpp
diff --git a/Source/WebCore/rendering/RenderButton.cpp b/Source/WebCore/rendering/RenderButton.cpp
index fd6911f49723d1cb1b0cf570cd96b07dcf9716dd..522e355bf06c8f0e9133fda8e3dcfe3d3e6ae458 100644
--- a/Source/WebCore/rendering/RenderButton.cpp
+++ b/Source/WebCore/rendering/RenderButton.cpp
@@ -71,7 +71,7 @@ void RenderButton::removeChild(RenderObject* oldChild)
         m_inner->removeChild(oldChild);
 }
 
-void RenderButton::styleWillChange(StyleDifference diff, const RenderStyle* newStyle)
+void RenderButton::styleWillChange(StyleDifference diff, const RenderStyle* newStyle, StyleChangeState& state)
 {
     if (m_inner) {
         // RenderBlock::setStyle is going to apply a new style to the inner block, which
@@ -83,12 +83,12 @@ void RenderButton::styleWillChange(StyleDifference diff, const RenderStyle* newS
         m_inner->style()->setMarginTop(newStyle->initialMargin());
         m_inner->style()->setMarginBottom(newStyle->initialMargin());
     }
-    RenderBlock::styleWillChange(diff, newStyle);
+    RenderBlock::styleWillChange(diff, newStyle, state);
 }
 
-void RenderButton::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
+void RenderButton::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle, const StyleChangeState& state)
 {
-    RenderBlock::styleDidChange(diff, oldStyle);
+    RenderBlock::styleDidChange(diff, oldStyle, state);
 
     if (m_buttonText)
         m_buttonText->setStyle(style());