Add web shell matcher for address field.

ios/testing/earl_grey/wait_util.h

+// 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.
+
+#ifndef IOS_TESTING_EARL_GREY_WAIT_UTIL_H_
+#define IOS_TESTING_EARL_GREY_WAIT_UTIL_H_
+
+#import <Foundation/Foundation.h>
+
+namespace testing {
+
+// Constant for UI wait loop in seconds.
+extern const NSTimeInterval kSpinDelaySeconds;
+
+// Constant for timeout in seconds while waiting for UI element.
+extern const NSTimeInterval kWaitForUIElementTimeout;
+}
+
+#endif  // IOS_TESTING_EARL_GREY_WAIT_UTIL_H_