Revert of Remove redundant "layout size changed" state from LayoutSVGRoot

third_party/WebKit/Source/core/layout/svg/LayoutSVGRoot.cpp

Index: third_party/WebKit/Source/core/layout/svg/LayoutSVGRoot.cpp
diff --git a/third_party/WebKit/Source/core/layout/svg/LayoutSVGRoot.cpp b/third_party/WebKit/Source/core/layout/svg/LayoutSVGRoot.cpp
index 8ba59de14eb4117a0106a1647fe0d635d55468ad..f33a86d98be80e895f1fc642a7b323ff857a92c4 100644
--- a/third_party/WebKit/Source/core/layout/svg/LayoutSVGRoot.cpp
+++ b/third_party/WebKit/Source/core/layout/svg/LayoutSVGRoot.cpp
@@ -153,11 +153,12 @@
 
     SVGSVGElement* svg = toSVGSVGElement(node());
     ASSERT(svg);
+    m_isLayoutSizeChanged = selfNeedsLayout() || (svg->hasRelativeLengths() && oldSize != size());
     // When hasRelativeLengths() is false, no descendants have relative lengths
     // (hence no one is interested in viewport size changes).
-    m_isLayoutSizeChanged = svg->hasRelativeLengths() && (selfNeedsLayout() || oldSize != size());
-
-    SVGLayoutSupport::layoutChildren(firstChild(), false, m_didScreenScaleFactorChange, m_isLayoutSizeChanged);
+    bool layoutSizeChanged = m_isLayoutSizeChanged && svg->hasRelativeLengths();
+
+    SVGLayoutSupport::layoutChildren(firstChild(), false, m_didScreenScaleFactorChange, layoutSizeChanged);
 
     if (m_needsBoundariesOrTransformUpdate) {
         updateCachedBoundaries();