Add ios_web_view_shell_egtests target and accessibility labels to shell.

ios/web_view/shell/test/earl_grey/web_view_shell_matchers.h

Index: ios/web_view/shell/test/earl_grey/web_view_shell_matchers.h
diff --git a/ios/web_view/shell/test/earl_grey/web_view_shell_matchers.h b/ios/web_view/shell/test/earl_grey/web_view_shell_matchers.h
new file mode 100644
index 0000000000000000000000000000000000000000..b0b7a4d0bbbae9542d0b64ada5c36979baec101f
--- /dev/null
+++ b/ios/web_view/shell/test/earl_grey/web_view_shell_matchers.h
@@ -0,0 +1,28 @@
+// Copyright 2017 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_WEB_VIEW_SHELL_TEST_EARL_GREY_WEB_VIEW_SHELL_MATCHERS_H_
+#define IOS_WEB_VIEW_SHELL_TEST_EARL_GREY_WEB_VIEW_SHELL_MATCHERS_H_
+
+#import <string>
+
+#import <EarlGrey/EarlGrey.h>
+
+namespace ios_web_view {
+
+// Matcher for web view shell address field text property equal to |text|.
+id<GREYMatcher> AddressFieldText(const std::string& text);
+
+// Matcher for back button in web view shell.
+id<GREYMatcher> BackButton();
+
+// Matcher for forward button in web view shell.
+id<GREYMatcher> ForwardButton();
+
+// Matcher for address field in web view shell.
+id<GREYMatcher> AddressField();
+
+}  // namespace ios_web_view
+
+#endif  // IOS_WEB_VIEW_SHELL_TEST_EARL_GREY_WEB_VIEW_SHELL_MATCHERS_H_