Web shell test to go back and forward.

ios/web/shell/test/shell_matchers.mm

Index: ios/web/shell/test/shell_matchers.mm
diff --git a/ios/web/shell/test/shell_matchers.mm b/ios/web/shell/test/shell_matchers.mm
new file mode 100644
index 0000000000000000000000000000000000000000..9f0c72f31024fd04f6b9462b93af8172cd04112b
--- /dev/null
+++ b/ios/web/shell/test/shell_matchers.mm
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+// 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.
+
+#import "ios/web/shell/test/shell_matchers.h"
+
+#import "ios/web/shell/view_controller.h"
+
+@implementation GREYMatchers (WebShellAdditions)
+
++ (id<GREYMatcher>)matcherForWebShellBackButton {
+  return grey_accessibilityLabel(kWebShellBackButtonAccessibilityLabel);
+}
+
++ (id<GREYMatcher>)matcherForWebShellForwardButton {
+  return grey_accessibilityLabel(kWebShellForwardButtonAccessibilityLabel);
+}
+
++ (id<GREYMatcher>)matcherForWebShellAddressField {
+  return grey_accessibilityLabel(kWebShellAddressFieldAccessibilityLabel);
+}
+
+@end
+
+#if !(GREY_DISABLE_SHORTHAND)
+
+id<GREYMatcher> shell_backButton() {
+  return [GREYMatchers matcherForWebShellBackButton];
+}
+
+id<GREYMatcher> shell_forwardButton() {
+  return [GREYMatchers matcherForWebShellForwardButton];
+}
+
+id<GREYMatcher> shell_addressField() {
+  return [GREYMatchers matcherForWebShellAddressField];
+}
+
+#endif