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diff --git a/ios/web/public/test/js_test_util.h b/ios/web/public/test/js_test_util.h
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+++ b/ios/web/public/test/js_test_util.h
@@ -0,0 +1,21 @@
+// Copyright 2014 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_PUBLIC_TEST_JS_TEST_UTIL_H_
+#define IOS_WEB_PUBLIC_TEST_JS_TEST_UTIL_H_
+
+@class CRWJSInjectionManager;
+@class CRWJSInjectionReceiver;
+@class NSString;
+
+namespace web {
+// Evaluates JavaScript on the |manager| and returns the result as a string.
+NSString* EvaluateJavaScriptAsString(CRWJSInjectionManager* manager,
+                                     NSString* script);
+// Evaluates JavaScript on the |receiver| and returns the result as a string.
+NSString* EvaluateJavaScriptAsString(CRWJSInjectionReceiver* receiver,
+                                     NSString* script);
+}  // namespace web
+
+#endif  // IOS_WEB_PUBLIC_TEST_JS_TEST_UTIL_H_