PolicyManager: New System provider.

The system provider exposes information about the device from
crossystem and the kernel boot command line options.

BUG=chromium:338587
TEST=Unit tests.

Change-Id: I2837a97740b63562155717cfe6a12fad69fd8cea
Reviewed-on: https://chromium-review.googlesource.com/191121
Reviewed-by: Alex Deymo <deymo@chromium.org>
Tested-by: Alex Deymo <deymo@chromium.org>
Commit-Queue: Alex Deymo <deymo@chromium.org>
diff --git a/policy_manager/real_system_provider.h b/policy_manager/real_system_provider.h
new file mode 100644
index 0000000..d5534cb
--- /dev/null
+++ b/policy_manager/real_system_provider.h
@@ -0,0 +1,27 @@
+// Copyright (c) 2014 The Chromium OS 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 CHROMEOS_PLATFORM_UPDATE_ENGINE_POLICY_MANAGER_REAL_SYSTEM_PROVIDER_H_
+#define CHROMEOS_PLATFORM_UPDATE_ENGINE_POLICY_MANAGER_REAL_SYSTEM_PROVIDER_H_
+
+#include <string>
+
+#include "update_engine/policy_manager/system_provider.h"
+
+namespace chromeos_policy_manager {
+
+// SystemProvider concrete implementation.
+class RealSystemProvider : public SystemProvider {
+ public:
+  RealSystemProvider() {}
+
+ private:
+  virtual bool DoInit() override;
+
+  DISALLOW_COPY_AND_ASSIGN(RealSystemProvider);
+};
+
+}  // namespace chromeos_policy_manager
+
+#endif  // CHROMEOS_PLATFORM_UPDATE_ENGINE_POLICY_MANAGER_REAL_SYSTEM_PROVIDER_H_