Rename the PolicyManager to UpdateManager.

This change renames the PolicyManager class, directory, tests, etc,
to avoid confusion with libpolicy and its classes.

BUG=chromium:373551
TEST=emerged on link.
CQ-DEPEND=CL:I43081673c7ba409f02273197da7915537bde39c6

Change-Id: Iffa76caa3b95ecbbdba87ab01006d1d8ce35a27f
Reviewed-on: https://chromium-review.googlesource.com/201876
Tested-by: Alex Deymo <deymo@chromium.org>
Reviewed-by: David Zeuthen <zeuthen@chromium.org>
Commit-Queue: Alex Deymo <deymo@chromium.org>
diff --git a/update_manager/system_provider.h b/update_manager/system_provider.h
new file mode 100644
index 0000000..831f377
--- /dev/null
+++ b/update_manager/system_provider.h
@@ -0,0 +1,39 @@
+// 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_UPDATE_MANAGER_SYSTEM_PROVIDER_H_
+#define CHROMEOS_PLATFORM_UPDATE_ENGINE_UPDATE_MANAGER_SYSTEM_PROVIDER_H_
+
+#include "update_engine/update_manager/provider.h"
+#include "update_engine/update_manager/variable.h"
+
+namespace chromeos_update_manager {
+
+// Provider for system information, mostly constant, such as the information
+// reported by crossystem, the kernel boot command line and the partition table.
+class SystemProvider : public Provider {
+ public:
+  virtual ~SystemProvider() {}
+
+  // Returns true if the boot mode is normal or if it's unable to
+  // determine the boot mode. Returns false if the boot mode is
+  // developer.
+  virtual Variable<bool>* var_is_normal_boot_mode() = 0;
+
+  // Returns whether this is an official Chrome OS build.
+  virtual Variable<bool>* var_is_official_build() = 0;
+
+  // Returns a variable that tells whether OOBE was completed.
+  virtual Variable<bool>* var_is_oobe_complete() = 0;
+
+ protected:
+  SystemProvider() {}
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(SystemProvider);
+};
+
+}  // namespace chromeos_update_manager
+
+#endif  // CHROMEOS_PLATFORM_UPDATE_ENGINE_UPDATE_MANAGER_SYSTEM_PROVIDER_H_