Add web shell matcher for address field.

ios/testing/earl_grey/BUILD.gn

+# 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.
+

[baxley, 2016/05/09 17:11:43]

I based this on ios/third_party/fishhook/BUILD.gn, which is of similar
complexity (or un-complexity :) ).

+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" ]
+}