app_shell: Add version number in user agent

extensions/shell/common/shell_content_client_unittest.cc

+// 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.
+
+#include "extensions/shell/common/shell_content_client.h"
+
+#include <string>
+
+#include "base/strings/string_util.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+typedef testing::Test ShellContentClientTest;
+
+namespace extensions {
+
+// Tests that the app_shell user agent looks like a Chrome user agent.
+TEST_F(ShellContentClientTest, UserAgentFormat) {
+  ShellContentClient client;
+  std::string user_agent = client.GetUserAgent();
+
+  // Must start with the usual Mozilla-compatibility string.
+  EXPECT_TRUE(StartsWithASCII(user_agent, "Mozilla/5.0", false)) << user_agent;
+
+  // Must contain a substring like "Chrome/1.2.3.4".
+  EXPECT_TRUE(MatchPattern(user_agent, "*Chrome/*.*.*.*")) << user_agent;
+}
+
+}  // namespace extensions