Reland "Avoid layout/full-repaint on view height change if possible"

Source/core/rendering/svg/RenderSVGRoot.cpp

Index: Source/core/rendering/svg/RenderSVGRoot.cpp
diff --git a/Source/core/rendering/svg/RenderSVGRoot.cpp b/Source/core/rendering/svg/RenderSVGRoot.cpp
index 4c81c671401eec0f949037ead39fe614ae4f33da..17c50ff4561197b7ca86ff570e32038b414f2e6f 100644
--- a/Source/core/rendering/svg/RenderSVGRoot.cpp
+++ b/Source/core/rendering/svg/RenderSVGRoot.cpp
@@ -174,10 +174,9 @@ LayoutUnit RenderSVGRoot::computeReplacedLogicalHeight() const
         if (height.isPercent()) {
             RenderBlock* cb = containingBlock();
             ASSERT(cb);
-            while (cb->isAnonymous()) {
+            while (cb->isAnonymous())
                 cb = cb->containingBlock();
-                cb->addPercentHeightDescendant(const_cast<RenderSVGRoot*>(this));
-            }
+            cb->addPercentHeightDescendant(const_cast<RenderSVGRoot*>(this));
         } else
             RenderBlock::removePercentHeightDescendant(const_cast<RenderSVGRoot*>(this));