Ignore rounding error between clip_layer_length_ and scroll_layer_length_

cc/layers/scrollbar_layer_impl_base.cc

Index: cc/layers/scrollbar_layer_impl_base.cc
diff --git a/cc/layers/scrollbar_layer_impl_base.cc b/cc/layers/scrollbar_layer_impl_base.cc
index a4981e95b2d75cbe9bf891152c788b6ac1da2985..bbd46676f7d51f32b21ac34da0078dfd6d1cc5df 100644
--- a/cc/layers/scrollbar_layer_impl_base.cc
+++ b/cc/layers/scrollbar_layer_impl_base.cc
@@ -66,7 +66,10 @@ bool ScrollbarLayerImplBase::CanScrollOrientation() const {
       layer_tree_impl()->LayerByElementId(scroll_element_id_);
   if (!scroll_layer)
     return false;
+
   return scroll_layer->user_scrollable(orientation()) &&
+         !MathUtil::IsFloatNearlyTheSame(clip_layer_length_,

[enne (OOO), 2017/04/21 22:54:33]

Can you leave a comment here about why you need this check, and that the
intended behavior is not to show the scrollbar when there's a rounding error and
these are nearly the same?

+                                         scroll_layer_length_) &&
          clip_layer_length_ < scroll_layer_length_;
 }