Implement put_accvalue for textfields and location bar.

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 4787e4e4af6281a38cf26fa9327643a4eb52d391..f556180f00f5f13e388b9e4a63e549b84856ace5 100644
--- a/ui/views/controls/textfield/textfield.cc
+++ b/ui/views/controls/textfield/textfield.cc
@@ -506,6 +506,9 @@ void Textfield::GetAccessibleState(ui::AccessibleViewState* state) {
   const ui::Range range = native_wrapper_->GetSelectedRange();
   state->selection_start = range.start();
   state->selection_end = range.end();
+
+  state->set_value_callback =
+      base::Bind(&Textfield::AccessibilitySetValue, AsWeakPtr());
 }
 
 ui::TextInputClient* Textfield::GetTextInputClient() {
@@ -554,6 +557,11 @@ gfx::Insets Textfield::GetTextInsets() const {
   return insets;
 }
 
+void Textfield::AccessibilitySetValue(const string16& new_value) {
+  SetText(new_value);
+  ClearSelection();
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // NativeTextfieldWrapper, public: