Add overflow:auto scrollbars to child flex basis.

Source/core/paint/DeprecatedPaintLayerScrollableArea.h

Index: Source/core/paint/DeprecatedPaintLayerScrollableArea.h
diff --git a/Source/core/paint/DeprecatedPaintLayerScrollableArea.h b/Source/core/paint/DeprecatedPaintLayerScrollableArea.h
index 035d19ea20e288eda978515fd4cd133989795910..ed0c9960531240f8b50dc9aa34d5739081fbd218 100644
--- a/Source/core/paint/DeprecatedPaintLayerScrollableArea.h
+++ b/Source/core/paint/DeprecatedPaintLayerScrollableArea.h
@@ -147,6 +147,9 @@ public:
         scrollToOffset(toDoubleSize(position), ScrollOffsetClamped, scrollBehavior);
     }
 
+    void updateScrollDimensions(DoubleSize& scrollOffset, bool& autoHorizontalScrollBarChanged, bool& autoVerticalScrollBarChanged);

[leviw_travelin_and_unemployed, 2015/08/20 18:53:06]

Seems like maybe these could just take a ScrollInfo parameter?

[szager1, 2015/08/20 21:53:29]

This file doesn't #include LayoutBlock.h, and I don't want to mess with that.  I
thought about defining ScrollInfo here instead, but it's really a
layout-specific thing (why does ScrollableArea need a separate ScrollInfo
object?).  So, I decided three parameters instead of one was not so terrible.

+    void finalizeScrollDimensions(const DoubleSize& originalScrollOffset, bool autoHorizontalScrollBarChanged, bool autoVerticalScrollBarChanged);
+
     void updateAfterLayout();
     void updateAfterStyleChange(const ComputedStyle*);
     void updateAfterOverflowRecalc();