Enable new dialog style transparency with Views Textfields.

ui/views/controls/textfield/textfield.cc

Index: ui/views/controls/textfield/textfield.cc
diff --git a/ui/views/controls/textfield/textfield.cc b/ui/views/controls/textfield/textfield.cc
index 1651c9b4b0a7e9a8e79efef0d581c8b88d83ae73..c5d26320d52d56b282385cc3563770f161740ea7 100644
--- a/ui/views/controls/textfield/textfield.cc
+++ b/ui/views/controls/textfield/textfield.cc
@@ -56,6 +56,9 @@ bool Textfield::IsViewsTextfieldEnabled() {
     return false;
   if (command_line->HasSwitch(switches::kEnableViewsTextfield))
     return true;
+  // The new dialog style cannot host native Windows textfield controls.
+  if (command_line->HasSwitch(switches::kEnableNewDialogStyle))
+    return true;
 #endif
   return true;
 }