Include auto vertical scrollbar in intrinsicScrollbarLogicalWidth.

third_party/WebKit/Source/core/layout/LayoutBlockFlow.cpp

Index: third_party/WebKit/Source/core/layout/LayoutBlockFlow.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutBlockFlow.cpp b/third_party/WebKit/Source/core/layout/LayoutBlockFlow.cpp
index defec5faeb81092d79943de82b87ce472cc96c7a..f98ab72daff52e42f04d09c19f592281d99b2453 100644
--- a/third_party/WebKit/Source/core/layout/LayoutBlockFlow.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutBlockFlow.cpp
@@ -471,6 +471,8 @@ inline bool LayoutBlockFlow::layoutBlockFlow(bool relayoutChildren, LayoutUnit &
 
     TextAutosizer::LayoutScope textAutosizerLayoutScope(this, &layoutScope);
 
+    bool preferredLogicalWidthsWereDirty = preferredLogicalWidthsDirty();
+
     // Reset the flag here instead of in layoutInlineChildren() in case that
     // all inline children are removed from this block.
     setContainsInlineWithOutlineAndContinuation(false);
@@ -479,6 +481,10 @@ inline bool LayoutBlockFlow::layoutBlockFlow(bool relayoutChildren, LayoutUnit &
     else
         layoutBlockChildren(relayoutChildren, layoutScope, beforeEdge, afterEdge);
 
+    bool preferredLogicalWidthsBecameDirty = !preferredLogicalWidthsWereDirty && preferredLogicalWidthsDirty();
+    if (preferredLogicalWidthsBecameDirty)
+        return false;
+
     // Expand our intrinsic height to encompass floats.
     if (lowestFloatLogicalBottom() > (logicalHeight() - afterEdge) && createsNewFormattingContext())
         setLogicalHeight(lowestFloatLogicalBottom() + afterEdge);