Add support for autofilling radio buttons and checkboxes.

chrome/browser/autofill/autofill_field.h

Index: chrome/browser/autofill/autofill_field.h
diff --git a/chrome/browser/autofill/autofill_field.h b/chrome/browser/autofill/autofill_field.h
index 0b2109852f503d3b04931d57d556bf7077df5055..e688fad0fffa346f2fa2d2e4e914335c1d99a318 100644
--- a/chrome/browser/autofill/autofill_field.h
+++ b/chrome/browser/autofill/autofill_field.h
@@ -56,6 +56,9 @@ class AutofillField : public FormFieldData {
   // field).
   bool IsFieldFillable() const;
 
+  void set_default_value(const std::string& value) { default_value_ = value; }
+  const std::string& default_value() const { return default_value_; }
+
  private:
   // The unique name of this field, generated by Autofill.
   string16 unique_name_;
@@ -76,6 +79,9 @@ class AutofillField : public FormFieldData {
   // Used to track whether this field is a phone prefix or suffix.
   PhonePart phone_part_;
 
+  // The default value returned by the Autofill server.
+  std::string default_value_;
+
   DISALLOW_COPY_AND_ASSIGN(AutofillField);
 };