Web shell test to go back and forward.

ios/web/shell/test/web_view_matchers.h

Index: ios/web/shell/test/web_view_matchers.h
diff --git a/ios/web/shell/test/web_view_matchers.h b/ios/web/shell/test/web_view_matchers.h
new file mode 100644
index 0000000000000000000000000000000000000000..2ca916db15d71f99801a84432590c2969b26c2c1
--- /dev/null
+++ b/ios/web/shell/test/web_view_matchers.h
@@ -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.
+
+#import <EarlGrey/EarlGrey.h>
+
+@interface GREYMatchers (WebViewAdditions)
+
+// Matcher for WKWebView containing |text|.
++ (id<GREYMatcher>)matcherForWebViewContainingText:(NSString*)text;
+
+#if !(GREY_DISABLE_SHORTHAND)
+
+// Shorthand for GREYMatchers::matcherForWebViewContainingText

[Eugene But (OOO till 7-30), 2016/04/21 22:53:08]

Optional NIT: Full stop at the end for consistency.

[baxley, 2016/04/22 02:02:59]

Done.

+GREY_EXPORT id<GREYMatcher> shell_webViewContainingText(NSString* text);
+
+#endif
+
+@end