[ios] Adds OmahaServiceProvider.

ios/public/provider/chrome/browser/omaha/test_omaha_service_provider.h

+// 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.
+
+#ifndef IOS_PUBLIC_PROVIDER_CHROME_BROWSER_OMAHA_TEST_OMAHA_SERVICE_PROVIDER_H_
+#define IOS_PUBLIC_PROVIDER_CHROME_BROWSER_OMAHA_TEST_OMAHA_SERVICE_PROVIDER_H_
+
+#include "ios/public/provider/chrome/browser/omaha/omaha_service_provider.h"
+
+class TestOmahaServiceProvider : public OmahaServiceProvider {
+ public:
+  TestOmahaServiceProvider();
+  ~TestOmahaServiceProvider() override;
+
+  // OmahaServiceProvider.
+  std::string GetUpdateServerURL() const override;
+  std::string GetApplicationID() const override;
+  std::string GetBrandCode() const override;
+  std::string GetDeviceIDSalt() const override;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(TestOmahaServiceProvider);
+};
+
+#endif  // IOS_PUBLIC_PROVIDER_CHROME_BROWSER_OMAHA_TEST_OMAHA_SERVICE_PROVIDER_H_