Defer pushing the parent stack in recalcStyle until StyleResolver::styleForElement()

Source/core/css/resolver/StyleResolver.cpp

Index: Source/core/css/resolver/StyleResolver.cpp
diff --git a/Source/core/css/resolver/StyleResolver.cpp b/Source/core/css/resolver/StyleResolver.cpp
index d025b389d881b8c6cabe58b730294e6ee77bb719..d20d78bc13534313e1e5fb71f2701df1f352d915 100644
--- a/Source/core/css/resolver/StyleResolver.cpp
+++ b/Source/core/css/resolver/StyleResolver.cpp
@@ -64,6 +64,7 @@
 #include "core/css/resolver/MediaQueryResult.h"
 #include "core/css/resolver/SharedStyleFinder.h"
 #include "core/css/resolver/StyleAdjuster.h"
+#include "core/css/resolver/StyleResolverParentScope.h"
 #include "core/css/resolver/StyleResolverStats.h"
 #include "core/css/resolver/ViewportStyleResolver.h"
 #include "core/dom/CSSSelectorWatch.h"
@@ -72,10 +73,10 @@
 #include "core/dom/Text.h"
 #include "core/dom/shadow/ElementShadow.h"
 #include "core/dom/shadow/ShadowRoot.h"
-#include "core/html/HTMLIFrameElement.h"
-#include "core/inspector/InspectorInstrumentation.h"
 #include "core/frame/Frame.h"
 #include "core/frame/FrameView.h"
+#include "core/html/HTMLIFrameElement.h"
+#include "core/inspector/InspectorInstrumentation.h"
 #include "core/rendering/RenderView.h"
 #include "core/rendering/style/KeyframeList.h"
 #include "core/rendering/style/StyleCustomFilterProgramCache.h"
@@ -682,6 +683,8 @@ PassRefPtr<RenderStyle> StyleResolver::styleForElement(Element* element, RenderS
             return sharedStyle.release();
     }
 
+    StyleResolverParentScope::pushScopes();

[eseidel, 2013/12/09 18:18:36]

This is really "ensure scopes are pushed" or something like that.

+
     if (state.parentStyle()) {
         state.setStyle(RenderStyle::create());
         state.style()->inheritFrom(state.parentStyle(), isAtShadowBoundary(element) ? RenderStyle::AtShadowBoundary : RenderStyle::NotAtShadowBoundary);
@@ -882,6 +885,8 @@ PassRefPtr<RenderStyle> StyleResolver::pseudoStyleForElement(Element* element, c
     if (!element)
         return 0;
 
+    StyleResolverParentScope::pushScopes();
+
     StyleResolverState state(document(), element, parentStyle);
 
     if (pseudoStyleRequest.allowsInheritance(state.parentStyle())) {