Add support for autofilling radio buttons and checkboxes.

chrome/browser/autofill/autofill_manager.cc

Index: chrome/browser/autofill/autofill_manager.cc
diff --git a/chrome/browser/autofill/autofill_manager.cc b/chrome/browser/autofill/autofill_manager.cc
index 89ce8f4fb6a026a71914655b1490de436798b652..e6a76f7e761871bc003e65aa5c936c4e8a8b1287 100644
--- a/chrome/browser/autofill/autofill_manager.cc
+++ b/chrome/browser/autofill/autofill_manager.cc
@@ -654,6 +654,26 @@ void AutofillManager::OnFillAutofillFormData(int query_id,
       // Mark the cached field as autofilled, so that we can detect when a user
       // edits an autofilled field (for metrics).
       form_structure->field(i)->is_autofilled = true;
+    } else if (cached_field->type() == FIELD_WITH_DEFAULT_VALUE &&
+               cached_field->is_checkable) {
+      // For a form with radio buttons, like:
+      // <form>
+      //   <input type="radio" name="sex" value="male">Male<br>
+      //   <input type="radio" name="sex" value="female">Female
+      // </form>
+      // If the default value specified at the server is "female", then
+      // Autofill server responds back with following field mappings
+      //   (fieldtype: FIELD_WITH_DEFAULT_VALUE, value: "female")
+      //   (fieldtype: FIELD_WITH_DEFAULT_VALUE, value: "female")
+      // Note that, the field mapping is repeated twice to respond to both the
+      // input elements with the same name/signature in the form.
+      string16 default_value = UTF8ToUTF16(cached_field->default_value());
+      // Mark the field checked if server says the default value of the field
+      // to be this field's value.
+      result.fields[i].is_checked = (default_value == result.fields[i].value);
+      // Mark the cached field as autofilled, so that we can detect when a user
+      // edits an autofilled field (for metrics).
+      form_structure->field(i)->is_autofilled = true;
     }
   }