Change LayoutState to be stack-allocated

Source/core/rendering/RenderInline.cpp

Index: Source/core/rendering/RenderInline.cpp
diff --git a/Source/core/rendering/RenderInline.cpp b/Source/core/rendering/RenderInline.cpp
index 2b40472574e315ca780dc4b46a82b0fc80f28c55..80664b5e3b1ad0ba9a917d967316600a1de84671 100644
--- a/Source/core/rendering/RenderInline.cpp
+++ b/Source/core/rendering/RenderInline.cpp
@@ -994,7 +994,7 @@ LayoutRect RenderInline::linesVisualOverflowBoundingBox() const
 
 LayoutRect RenderInline::clippedOverflowRectForPaintInvalidation(const RenderLayerModelObject* paintInvalidationContainer) const
 {
-    ASSERT(!view() || !view()->layoutStateEnabled());
+    ASSERT(!view() || !view()->layoutStateCachedOffsetsEnabled());
 
     if (!firstLineBoxIncludingCulling() && !continuation())
         return LayoutRect();
@@ -1056,7 +1056,7 @@ void RenderInline::mapRectToPaintInvalidationBacking(const RenderLayerModelObjec
 {
     if (RenderView* v = view()) {
         // LayoutState is only valid for root-relative repainting
-        if (v->canUseLayoutStateForContainer(paintInvalidationContainer)) {
+        if (v->canMapUsingLayoutStateForContainer(paintInvalidationContainer)) {

[esprehn, 2014/06/13 23:25:26]

You could probably do this rename separately to make the patch smaller if you
want.

             LayoutState* layoutState = v->layoutState();
             if (style()->hasInFlowPosition() && layer())
                 rect.move(layer()->offsetForInFlowPosition());
@@ -1143,7 +1143,7 @@ void RenderInline::mapLocalToContainer(const RenderLayerModelObject* repaintCont
         return;
 
     if (RenderView *v = view()) {
-        if (v->canUseLayoutStateForContainer(repaintContainer)) {
+        if (v->canMapUsingLayoutStateForContainer(repaintContainer)) {
             LayoutState* layoutState = v->layoutState();
             LayoutSize offset = layoutState->paintOffset();
             if (style()->hasInFlowPosition() && layer())