Implemented IA2::setSelection and related methods on text fields in Views.

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 217bb57a1247b35ab9fe89594162a04427f8c6ba..c6cdafc79b58c94dc1d0f151b4babf1d1bc95de0 100644
--- a/ui/views/controls/textfield/textfield.cc
+++ b/ui/views/controls/textfield/textfield.cc
@@ -897,6 +897,12 @@ void Textfield::GetAccessibleNodeData(ui::AXNodeData* node_data) {
 }
 
 bool Textfield::HandleAccessibleAction(const ui::AXActionData& action_data) {
+  if (action_data.action == ui::AX_ACTION_SET_SELECTION) {
+    const gfx::Range range(action_data.anchor_offset, action_data.focus_offset);
+    SetSelectionRange(range);
+  }
+
+  // Remaining actions cannot be performed on readonly fields.
   if (read_only())
     return View::HandleAccessibleAction(action_data);