Web shell test to go back and forward.

ios/web/shell/test/utils/web_view_egutil.h

Index: ios/web/shell/test/utils/web_view_egutil.h
diff --git a/ios/web/shell/test/utils/web_view_egutil.h b/ios/web/shell/test/utils/web_view_egutil.h
new file mode 100644
index 0000000000000000000000000000000000000000..5115d0e3fb9154e0ea97c571fb4ee22ebc3e5ac5
--- /dev/null
+++ b/ios/web/shell/test/utils/web_view_egutil.h
@@ -0,0 +1,19 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.

[Eugene But (OOO till 7-30), 2016/04/21 17:07:53]

This file will contain matchers, right? So I think we should be more specific
with name (f.e. web_view_matchers)

[baxley, 2016/04/21 21:52:51]

Done.

+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#import <EarlGrey/EarlGrey.h>
+
+@interface GREYMatchers (WebShellAdditions)
+
+// Matcher for WKWebView containing |text|.
++ (id<GREYMatcher>)matcherForWebViewContainingText:(NSString*)text;
+
+#if !(GREY_DISABLE_SHORTHAND)
+
+// Shorthand for GREYMatchers::matcherForWebViewContainingText
+GREY_EXPORT id<GREYMatcher> shell_webViewContainingText(NSString* text);
+
+#endif
+
+@end