Create base class for web shell Earl Grey tests.

ios/web/shell/test/earl_grey/shell_base_test_case.mm

Index: ios/web/shell/test/earl_grey/shell_base_test_case.mm
diff --git a/ios/web/shell/test/earl_grey/shell_base_test_case.mm b/ios/web/shell/test/earl_grey/shell_base_test_case.mm
new file mode 100644
index 0000000000000000000000000000000000000000..e30ea64fbea7762d65a55216e8a844157c44857c
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+++ b/ios/web/shell/test/earl_grey/shell_base_test_case.mm
@@ -0,0 +1,37 @@
+// 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/earl_grey/shell_base_test_case.h"
+
+#import <EarlGrey/EarlGrey.h>
+
+#import "ios/web/public/test/http_server.h"
+#import "ios/web/shell/test/earl_grey/shell_matchers.h"
+
+using web::test::HttpServer;
+using web::webViewContainingText;
+
+@implementation ShellBaseTestCase
+
+// Set up called once for the class.
++ (void)setUp {
+  [super setUp];
+  [[EarlGrey selectElementWithMatcher:webViewContainingText("Chromium")]
+      assertWithMatcher:grey_notNil()];
+  HttpServer::GetSharedInstance().StartOrDie();
+}
+
+// Tear down called once for the class.
++ (void)tearDown {
+  HttpServer::GetSharedInstance().Stop();
+  [super tearDown];
+}
+
+// Tear down called after each test.
+- (void)tearDown {
+  HttpServer::GetSharedInstance().RemoveAllResponseProviders();
+  [super tearDown];
+}
+
+@end