[ios] Adds OmahaServiceProvider.

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

Index: ios/public/provider/chrome/browser/omaha/test_omaha_service_provider.mm
diff --git a/ios/public/provider/chrome/browser/omaha/test_omaha_service_provider.mm b/ios/public/provider/chrome/browser/omaha/test_omaha_service_provider.mm
new file mode 100644
index 0000000000000000000000000000000000000000..654fbb7018a5ed50827dd5d958eba511875d3f29
--- /dev/null
+++ b/ios/public/provider/chrome/browser/omaha/test_omaha_service_provider.mm
@@ -0,0 +1,25 @@
+// 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/public/provider/chrome/browser/omaha/test_omaha_service_provider.h"
+
+TestOmahaServiceProvider::TestOmahaServiceProvider() {}
+
+TestOmahaServiceProvider::~TestOmahaServiceProvider() {}
+
+std::string TestOmahaServiceProvider::GetUpdateServerURL() const {
+  return std::string();
+}
+
+std::string TestOmahaServiceProvider::GetApplicationID() const {
+  return std::string();
+}
+
+std::string TestOmahaServiceProvider::GetBrandCode() const {
+  return std::string();
+}
+
+std::string TestOmahaServiceProvider::GetDeviceIDSalt() const {
+  return std::string();
+}