Fixed crash when a SinglesplitView gets embdedded inside SingleSplitView

views/controls/single_split_view.cc

Index: views/controls/single_split_view.cc
diff --git a/views/controls/single_split_view.cc b/views/controls/single_split_view.cc
index 5addbb9186014c56a3cce95d8918c8d24c02d58c..f6ea618859f14b26f0f71e3920f7badf991751b0 100644
--- a/views/controls/single_split_view.cc
+++ b/views/controls/single_split_view.cc
@@ -246,7 +246,8 @@ int SingleSplitView::NormalizeDividerOffset(int divider_offset,
                                             const gfx::Rect& bounds) const {
   int primary_axis_size = GetPrimaryAxisSize(bounds.width(), bounds.height());
   if (divider_offset < 0)
-    return (primary_axis_size - kDividerSize) / 2;
+    // primary_axis_size may < kDividerSize during initial layout.
+    return std::max(0, (primary_axis_size - kDividerSize) / 2);
   return std::min(divider_offset,
                   std::max(primary_axis_size - kDividerSize, 0));
 }