first import

sites/all/modules/addressfield/views/addressfield.views.inc

@@ -0,0 +1,26 @@
+<?php
+
+/**
+ * Implements hook_field_views_data().
+ */
+function addressfield_field_views_data($field) {
+  $data = field_views_field_default_views_data($field);
+
+  // Add a handler for countries.
+  foreach ($field['storage']['details']['sql'] as $type => $tables) {
+    foreach ($tables as $table_name => $columns) {
+      if (!isset($columns['country'])) {
+        continue;
+      }
+      
+      $column_real_name = $columns['country'];
+      if (!isset($data[$table_name][$column_real_name]['filter'])) {
+        continue;
+      }
+
+      $data[$table_name][$column_real_name]['filter']['handler'] = 'addressfield_views_handler_filter_country';
+    }
+  }
+
+  return $data;
+}

sites/all/modules/addressfield/views/addressfield_views_handler_filter_country.inc

@@ -0,0 +1,9 @@
+<?php
+
+class addressfield_views_handler_filter_country extends views_handler_filter_in_operator {
+  function get_value_options() {
+    $this->value_title = t('Country');
+    $field = field_info_field($this->definition['field_name']);
+    $this->value_options = _addressfield_country_options_list($field);
+  }
+}