diff --git a/src/net/proxy/mock_proxy_script_fetcher.h b/src/net/proxy/mock_proxy_script_fetcher.h
new file mode 100644
index 0000000..12b963f
--- /dev/null
+++ b/src/net/proxy/mock_proxy_script_fetcher.h
@@ -0,0 +1,48 @@
+// Copyright (c) 2012 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 NET_PROXY_MOCK_PROXY_SCRIPT_FETCHER_H_
+#define NET_PROXY_MOCK_PROXY_SCRIPT_FETCHER_H_
+
+#include "base/compiler_specific.h"
+#include "googleurl/src/gurl.h"
+#include "net/proxy/proxy_script_fetcher.h"
+
+#include <string>
+
+namespace net {
+
+class URLRequestContext;
+
+// A mock ProxyScriptFetcher. No result will be returned to the fetch client
+// until we call NotifyFetchCompletion() to set the results.
+class MockProxyScriptFetcher : public ProxyScriptFetcher {
+ public:
+  MockProxyScriptFetcher();
+  virtual ~MockProxyScriptFetcher();
+
+  // ProxyScriptFetcher implementation.
+  virtual int Fetch(const GURL& url,
+                    string16* text,
+                    const CompletionCallback& callback) OVERRIDE;
+  virtual void Cancel() OVERRIDE;
+  virtual URLRequestContext* GetRequestContext() const OVERRIDE;
+
+  void NotifyFetchCompletion(int result, const std::string& ascii_text);
+  const GURL& pending_request_url() const;
+  bool has_pending_request() const;
+
+  // Spins the message loop until this->Fetch() is invoked.
+  void WaitUntilFetch();
+
+ private:
+  GURL pending_request_url_;
+  CompletionCallback pending_request_callback_;
+  string16* pending_request_text_;
+  bool waiting_for_fetch_;
+};
+
+}  // namespace net
+
+#endif  // NET_PROXY_MOCK_PROXY_SCRIPT_FETCHER_H_