Add infrastructure for partial layouts

Source/core/dom/Element.cpp

Index: Source/core/dom/Element.cpp
diff --git a/Source/core/dom/Element.cpp b/Source/core/dom/Element.cpp
index 01190e052558715176dd98e24bad95cf522f39f9..effebc54e73a873312aa9ba6a575e44790978c63 100644
--- a/Source/core/dom/Element.cpp
+++ b/Source/core/dom/Element.cpp
@@ -568,7 +568,7 @@ static int adjustForLocalZoom(LayoutUnit value, RenderObject* renderer)
 
 int Element::offsetLeft()
 {
-    document()->updateLayoutIgnorePendingStylesheets();
+    document()->tryPartialUpdateLayoutIgnorePendingStylesheets(renderer());

[esprehn, 2013/08/18 03:43:15]

partialUpdateLayoutIgnorePendingStylesheet(this)

[pdr., 2013/08/20 06:19:10]

Done.

     if (RenderBoxModelObject* renderer = renderBoxModelObject())
         return adjustForLocalZoom(renderer->pixelSnappedOffsetLeft(), renderer);
     return 0;
@@ -576,7 +576,7 @@ int Element::offsetLeft()
 
 int Element::offsetTop()
 {
-    document()->updateLayoutIgnorePendingStylesheets();
+    document()->tryPartialUpdateLayoutIgnorePendingStylesheets(renderer());
     if (RenderBoxModelObject* renderer = renderBoxModelObject())
         return adjustForLocalZoom(renderer->pixelSnappedOffsetTop(), renderer);
     return 0;
@@ -591,7 +591,7 @@ int Element::offsetWidth()
             return adjustLayoutUnitForAbsoluteZoom(renderer->fixedOffsetWidth(), renderer).round();
     }
 
-    document()->updateLayoutIgnorePendingStylesheets();
+    document()->tryPartialUpdateLayoutIgnorePendingStylesheets(renderer());
     if (RenderBoxModelObject* renderer = renderBoxModelObject())
         return adjustLayoutUnitForAbsoluteZoom(renderer->pixelSnappedOffsetWidth(), renderer).round();
     return 0;
@@ -599,7 +599,7 @@ int Element::offsetWidth()
 
 int Element::offsetHeight()
 {
-    document()->updateLayoutIgnorePendingStylesheets();
+    document()->tryPartialUpdateLayoutIgnorePendingStylesheets(renderer());
     if (RenderBoxModelObject* renderer = renderBoxModelObject())
         return adjustLayoutUnitForAbsoluteZoom(renderer->pixelSnappedOffsetHeight(), renderer).round();
     return 0;