Add web shell matcher for address field.

ios/testing/earl_grey/BUILD.gn

Index: ios/testing/earl_grey/BUILD.gn
diff --git a/ios/testing/earl_grey/BUILD.gn b/ios/testing/earl_grey/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..40cfc52ef7c3669fc7bcb5f6fa3106e3a9e46ec6
--- /dev/null
+++ b/ios/testing/earl_grey/BUILD.gn
@@ -0,0 +1,19 @@
+# Copyright 2016 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+config("earl_grey_support_config") {
+  include_dirs = [ "." ]
+  visibility = [ ":earl_grey_support" ]
+}
+
+source_set("earl_grey_support") {
+  testonly = true
+  sources = [
+    "wait_util.h",
+    "wait_util.mm",
+  ]
+
+  public_configs = [ ":earl_grey_support_config" ]
+  configs += [ ":earl_grey_support_config" ]
+}