components/arc/common/metrics.mojom

// Copyright 2016 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.

module arc.mojom;

// Describes a boot progress event.
struct BootProgressEvent {
  // Name of the boot progress event in Android. Currently there are
  // 11 boot progress events found in Android source repository:
  //   system/core/logcat/event.logtags
  //   frameworks/base/services/core/java/com/android/server/am/
  //       EventLogTags.logtags
  //   frameworks/base/services/core/java/com/android/server/
  //       EventLogTags.logtags
  string event;

  // Timestamp of the event in uptime obtained in ARC. The uptime
  // is from clock source MONOTONIC_CLOCK since Chrome OS boots up.
  // Therefore, we need to calibrate the correct elapsed time of the
  // event by comparing the uptime with the ARC start time from
  // the same clock source MONOTONIC_CLOCK in session manager.
  int64 uptimeMillis;
};

interface MetricsHost {
  // Report boot progress events from ARC instance.
  ReportBootProgress@0(array<BootProgressEvent> events);
};

interface MetricsInstance {
  Init@0(MetricsHost host_ptr);
};