Browser should get notified if a views textfield changes focus. In addition,

views/controls/textfield/textfield.cc

Index: views/controls/textfield/textfield.cc
diff --git a/views/controls/textfield/textfield.cc b/views/controls/textfield/textfield.cc
index a228ed970e2480e3b1da0406c3231de7aef92fb9..2d23381f8ff4f56c5121a5d1c23d86f554e78719 100644
--- a/views/controls/textfield/textfield.cc
+++ b/views/controls/textfield/textfield.cc
@@ -352,6 +352,10 @@ void Textfield::WillLoseFocus() {
     native_wrapper_->HandleWillLoseFocus();
 }
 
+View::ContentType Textfield::GetContentType() const {
+  return View::GENERIC_INPUT;
+}
+
 AccessibilityTypes::Role Textfield::GetAccessibleRole() {
   return AccessibilityTypes::ROLE_TEXT;
 }