Add ios_web_view_shell_egtests target and accessibility labels to shell.

ios/web_view/shell/test/shell_egtest.mm

Index: ios/web_view/shell/test/shell_egtest.mm
diff --git a/ios/web_view/shell/test/shell_egtest.mm b/ios/web_view/shell/test/shell_egtest.mm
new file mode 100644
index 0000000000000000000000000000000000000000..0a0c5e2c8aa1774610a94c464eefd9d06e35c2ab
--- /dev/null
+++ b/ios/web_view/shell/test/shell_egtest.mm
@@ -0,0 +1,13 @@
+// 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.
+
+#import <XCTest/XCTest.h>
+
+// Empty test case file for the web view shell.

[Eugene But (OOO till 7-30), 2017/03/08 21:42:44]

We should try to align this with ShellBaseTestCase and have either 

WebShellBaseTestCase / WebViewShellBaseTestCase or
WebShellTestCase / WebViewShellTestCase

I guess baxley@ can tell us if there was a reason for suing Base work in the
class name

[michaeldo, 2017/03/08 21:58:31]

I agree, I had a base class already but wanted to split the actual tests out of
the CL and so removed the base class from here.

+@interface ShellTestCase : XCTestCase
+@end
+
+@implementation ShellTestCase
+
+@end