Tracking push events for lucid sleep

chrome/browser/chromeos/power/light_bar.cc

-// Copyright 2014 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/browser/chromeos/power/light_bar.h"
-
-#include <cstring>  // needed for strlen()
-
-#include "base/command_line.h"
-#include "base/files/file_util.h"
-#include "base/logging.h"
-#include "base/message_loop/message_loop.h"
-#include "chromeos/chromeos_switches.h"
-#include "chromeos/dbus/dbus_thread_manager.h"
-
-namespace chromeos {
-
-namespace {
-const int kDarkSuspendDelaySeconds = 4;
-const char kLightBarControlPath[] =
-    "/sys/devices/platform/cros_ec_lpc.0/cros-ec-dev.0/chromeos/cros_ec/"
-    "lightbar/sequence";
-const char kKonamiCommand[] = "KONAMI";
-
-}  // namespace
-
-LightBar::LightBar()
-    : control_path_(base::FilePath(kLightBarControlPath)),
-      has_light_bar_(base::PathIsWritable(control_path_)) {
-  DBusThreadManager::Get()->GetPowerManagerClient()->AddObserver(this);
-}
-
-LightBar::~LightBar() {
-  DBusThreadManager::Get()->GetPowerManagerClient()->RemoveObserver(this);
-}
-
-void LightBar::DarkSuspendImminent() {
-  // The plan is to track the progress of push events and then re-suspend as
-  // soon as we know they have been processed.  In the meanwhile, we can hack
-  // around this by just having the light bar delay for a long time so that
-  // people can at least start playing around with this feature for their apps.
-  //
-  // TODO(chirantan): Remove this once we can accurately track the progress of
-  // push events.
-  base::MessageLoop::current()->PostDelayedTask(
-      FROM_HERE,
-      DBusThreadManager::Get()
-          ->GetPowerManagerClient()
-          ->GetSuspendReadinessCallback(),
-      base::TimeDelta::FromSeconds(kDarkSuspendDelaySeconds));
-
-  if (!has_light_bar_)
-    return;
-
-  if (base::WriteFile(control_path_, kKonamiCommand, strlen(kKonamiCommand)) !=
-      static_cast<int>(strlen(kKonamiCommand)))
-    PLOG(WARNING) << "Unable to flash light bar during dark resume.";
-}
-
-}  // namespace chromeos