Round the corners of bookmark button ink drop effects.

ui/views/controls/button/label_button.cc

Index: ui/views/controls/button/label_button.cc
diff --git a/ui/views/controls/button/label_button.cc b/ui/views/controls/button/label_button.cc
index d1149469833ecdf21a83b9e23f1581f02b71f0d0..d74fc8dbe0e57ed754635d9d56a23c36747b9e8a 100644
--- a/ui/views/controls/button/label_button.cc
+++ b/ui/views/controls/button/label_button.cc
@@ -423,10 +423,12 @@ void LabelButton::AddInkDropLayer(ui::Layer* ink_drop_layer) {
   image()->SetPaintToLayer();
   image()->layer()->SetFillsBoundsOpaquely(false);
   ink_drop_container_->AddInkDropLayer(ink_drop_layer);
+  InstallInkDropMask(ink_drop_layer);
 }
 
 void LabelButton::RemoveInkDropLayer(ui::Layer* ink_drop_layer) {
   image()->DestroyLayer();
+  ResetInkDropMask();
   ink_drop_container_->RemoveInkDropLayer(ink_drop_layer);
 }