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/updater_provider.h b/update_manager/updater_provider.h
new file mode 100644
index 0000000..051ad3a
--- /dev/null
+++ b/update_manager/updater_provider.h
@@ -0,0 +1,91 @@
+// 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_UPDATER_PROVIDER_H_
+#define CHROMEOS_PLATFORM_UPDATE_ENGINE_UPDATE_MANAGER_UPDATER_PROVIDER_H_
+
+#include <string>
+
+#include <base/time/time.h>
+
+#include "update_engine/update_manager/provider.h"
+#include "update_engine/update_manager/variable.h"
+
+namespace chromeos_update_manager {
+
+enum class Stage {
+  kIdle,
+  kCheckingForUpdate,
+  kUpdateAvailable,
+  kDownloading,
+  kVerifying,
+  kFinalizing,
+  kUpdatedNeedReboot,
+  kReportingErrorEvent,
+  kAttemptingRollback,
+};
+
+// Provider for Chrome OS update related information.
+class UpdaterProvider : public Provider {
+ public:
+  virtual ~UpdaterProvider() {}
+
+  // A variable returning the timestamp when the update engine was started in
+  // wallclock time.
+  virtual Variable<base::Time>* var_updater_started_time() = 0;
+
+  // A variable returning the last update check time.
+  virtual Variable<base::Time>* var_last_checked_time() = 0;
+
+  // A variable reporting the time when an update was last completed in the
+  // current boot cycle. Returns an error if an update completed time could not
+  // be read (e.g. no update was completed in the current boot cycle) or is
+  // invalid.
+  //
+  // IMPORTANT: The time reported is not the wallclock time reading at the time
+  // of the update, rather it is the point in time when the update completed
+  // relative to the current wallclock time reading. Therefore, the gap between
+  // the reported value and the current wallclock time is guaranteed to be
+  // monotonically increasing.
+  virtual Variable<base::Time>* var_update_completed_time() = 0;
+
+  // A variable returning the update progress (0.0 to 1.0).
+  virtual Variable<double>* var_progress() = 0;
+
+  // A variable returning the current update status.
+  virtual Variable<Stage>* var_stage() = 0;
+
+  // A variable returning the update target version.
+  virtual Variable<std::string>* var_new_version() = 0;
+
+  // A variable returning the update payload size. The payload size is
+  // guaranteed to be non-negative.
+  virtual Variable<int64_t>* var_payload_size() = 0;
+
+  // A variable returning the current channel.
+  virtual Variable<std::string>* var_curr_channel() = 0;
+
+  // A variable returning the update target channel.
+  virtual Variable<std::string>* var_new_channel() = 0;
+
+  // A variable indicating whether user settings allow P2P updates.
+  virtual Variable<bool>* var_p2p_enabled() = 0;
+
+  // A variable indicating whether user settings allow updates over a cellular
+  // network.
+  virtual Variable<bool>* var_cellular_enabled() = 0;
+
+  // A variable returning the number of consecutive failed update checks.
+  virtual Variable<unsigned int>* var_consecutive_failed_update_checks() = 0;
+
+ protected:
+  UpdaterProvider() {}
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(UpdaterProvider);
+};
+
+}  // namespace chromeos_update_manager
+
+#endif  // CHROMEOS_PLATFORM_UPDATE_ENGINE_UPDATE_MANAGER_UPDATER_PROVIDER_H_