Add platform_app flag to manifest.

chrome/test/base/scoped_command_line_override.cc

+// Copyright (c) 2011 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 "chrome/test/base/scoped_command_line_override.h"
+
+ScopedCommandLineOverride::ScopedCommandLineOverride(
+    const std::string& new_switch)
+    : old_command_line_(*CommandLine::ForCurrentProcess()) {
+  CommandLine::ForCurrentProcess()->AppendSwitch(new_switch);
+}
+
+ScopedCommandLineOverride::~ScopedCommandLineOverride() {
+  *CommandLine::ForCurrentProcess() = old_command_line_;
+}