Split the power monitoring feature from SystemMonitor

The SystemMonitor is a mixed monitor which not only monitors
the power state changes but also the devices changes. This
patch is to separate the power monitor from SystemMonitor
as a new class PowerMonitor which is dedicated to monitor
power state.

The next step is to seek a opportunity to refactor SystemMonitor
as something like DeviceMonitor.

BUG=149059
TEST=base_unittests --gtest_filter=PowerMonitorTest.*

Review URL: https://chromiumcodereview.appspot.com/10959020

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@192114 0039d316-1c4b-4281-b951-d872f2087c98

9 files changed, 4 insertions, 611 deletions

diff --git a/base/system_monitor/system_monitor.cc b/base/system_monitor/system_monitor.cc
index 7c960cc..b934139 100644
--- a/base/system_monitor/system_monitor.cc
+++ b/base/system_monitor/system_monitor.cc
@@ -14,36 +14,14 @@ namespace base {
 
 static SystemMonitor* g_system_monitor = NULL;
 
-#if defined(ENABLE_BATTERY_MONITORING)
-// The amount of time (in ms) to wait before running the initial
-// battery check.
-static int kDelayedBatteryCheckMs = 10 * 1000;
-#endif  // defined(ENABLE_BATTERY_MONITORING)
-
 SystemMonitor::SystemMonitor()
-    : power_observer_list_(new ObserverListThreadSafe<PowerObserver>()),
-      devices_changed_observer_list_(
-          new ObserverListThreadSafe<DevicesChangedObserver>()),
-      battery_in_use_(false),
-      suspended_(false) {
+    :  devices_changed_observer_list_(
+          new ObserverListThreadSafe<DevicesChangedObserver>()) {
   DCHECK(!g_system_monitor);
   g_system_monitor = this;
-
-  DCHECK(MessageLoop::current());
-#if defined(ENABLE_BATTERY_MONITORING)
-  delayed_battery_check_.Start(FROM_HERE,
-      base::TimeDelta::FromMilliseconds(kDelayedBatteryCheckMs), this,
-      &SystemMonitor::BatteryCheck);
-#endif  // defined(ENABLE_BATTERY_MONITORING)
-#if defined(OS_MACOSX)
-  PlatformInit();
-#endif
 }
 
 SystemMonitor::~SystemMonitor() {
-#if defined(OS_MACOSX)
-  PlatformDestroy();
-#endif
   DCHECK_EQ(this, g_system_monitor);
   g_system_monitor = NULL;
 }
@@ -53,46 +31,10 @@ SystemMonitor* SystemMonitor::Get() {
   return g_system_monitor;
 }
 
-void SystemMonitor::ProcessPowerMessage(PowerEvent event_id) {
-  // Suppress duplicate notifications.  Some platforms may
-  // send multiple notifications of the same event.
-  switch (event_id) {
-    case POWER_STATE_EVENT:
-      {
-        bool on_battery = IsBatteryPower();
-        if (on_battery != battery_in_use_) {
-          battery_in_use_ = on_battery;
-          NotifyPowerStateChange();
-        }
-      }
-      break;
-    case RESUME_EVENT:
-      if (suspended_) {
-        suspended_ = false;
-        NotifyResume();
-      }
-      break;
-    case SUSPEND_EVENT:
-      if (!suspended_) {
-        suspended_ = true;
-        NotifySuspend();
-      }
-      break;
-  }
-}
-
 void SystemMonitor::ProcessDevicesChanged(DeviceType device_type) {
   NotifyDevicesChanged(device_type);
 }
 
-void SystemMonitor::AddPowerObserver(PowerObserver* obs) {
-  power_observer_list_->AddObserver(obs);
-}
-
-void SystemMonitor::RemovePowerObserver(PowerObserver* obs) {
-  power_observer_list_->RemoveObserver(obs);
-}
-
 void SystemMonitor::AddDevicesChangedObserver(DevicesChangedObserver* obs) {
   devices_changed_observer_list_->AddObserver(obs);
 }
@@ -107,25 +49,4 @@ void SystemMonitor::NotifyDevicesChanged(DeviceType device_type) {
       &DevicesChangedObserver::OnDevicesChanged, device_type);
 }
 
-void SystemMonitor::NotifyPowerStateChange() {
-  DVLOG(1) << "PowerStateChange: " << (BatteryPower() ? "On" : "Off")
-           << " battery";
-  power_observer_list_->Notify(&PowerObserver::OnPowerStateChange,
-                               BatteryPower());
-}
-
-void SystemMonitor::NotifySuspend() {
-  DVLOG(1) << "Power Suspending";
-  power_observer_list_->Notify(&PowerObserver::OnSuspend);
-}
-
-void SystemMonitor::NotifyResume() {
-  DVLOG(1) << "Power Resuming";
-  power_observer_list_->Notify(&PowerObserver::OnResume);
-}
-
-void SystemMonitor::BatteryCheck() {
-  ProcessPowerMessage(SystemMonitor::POWER_STATE_EVENT);
-}
-
 }  // namespace base
diff --git a/base/system_monitor/system_monitor.h b/base/system_monitor/system_monitor.h
index 10f279f..5dd849f 100644
--- a/base/system_monitor/system_monitor.h
+++ b/base/system_monitor/system_monitor.h
@@ -5,35 +5,11 @@
 #ifndef BASE_SYSTEM_MONITOR_SYSTEM_MONITOR_H_
 #define BASE_SYSTEM_MONITOR_SYSTEM_MONITOR_H_
 
-#include <map>
-#include <string>
-#include <vector>
-
 #include "base/base_export.h"
 #include "base/basictypes.h"
-#include "build/build_config.h"
-
-// Windows HiRes timers drain the battery faster so we need to know the battery
-// status.  This isn't true for other platforms.
-#if defined(OS_WIN)
-#define ENABLE_BATTERY_MONITORING 1
-#else
-#undef ENABLE_BATTERY_MONITORING
-#endif  // !OS_WIN
-
+#include "base/memory/ref_counted.h"
 #include "base/observer_list_threadsafe.h"
-#if defined(ENABLE_BATTERY_MONITORING)
-#include "base/timer.h"
-#endif  // defined(ENABLE_BATTERY_MONITORING)
-
-#if defined(OS_MACOSX) && !defined(OS_IOS)
-#include <IOKit/pwr_mgt/IOPMLib.h>
-#include <IOKit/IOMessage.h>
-#endif  // OS_MACOSX && !OS_IOS
-
-#if defined(OS_IOS)
-#include <objc/runtime.h>
-#endif  // OS_IOS
+#include "build/build_config.h"
 
 namespace base {
 
@@ -42,13 +18,6 @@ namespace base {
 // TODO(mbelshe):  Add support beyond just power management.
 class BASE_EXPORT SystemMonitor {
  public:
-  // Normalized list of power events.
-  enum PowerEvent {
-    POWER_STATE_EVENT,  // The Power status of the system has changed.
-    SUSPEND_EVENT,      // The system is being suspended.
-    RESUME_EVENT        // The system is being resumed.
-  };
-
   // Type of devices whose change need to be monitored, such as add/remove.
   enum DeviceType {
     DEVTYPE_AUDIO_CAPTURE,  // Audio capture device, e.g., microphone.
@@ -64,50 +33,6 @@ class BASE_EXPORT SystemMonitor {
   // Get the application-wide SystemMonitor (if not present, returns NULL).
   static SystemMonitor* Get();
 
-#if defined(OS_MACOSX)
-  // Allocate system resources needed by the SystemMonitor class.
-  //
-  // This function must be called before instantiating an instance of the class
-  // and before the Sandbox is initialized.
-#if !defined(OS_IOS)
-  static void AllocateSystemIOPorts();
-#else
-  static void AllocateSystemIOPorts() {}
-#endif  // OS_IOS
-#endif  // OS_MACOSX
-
-  //
-  // Power-related APIs
-  //
-
-  // Is the computer currently on battery power.
-  // Can be called on any thread.
-  bool BatteryPower() const {
-    // Using a lock here is not necessary for just a bool.
-    return battery_in_use_;
-  }
-
-  // Callbacks will be called on the thread which creates the SystemMonitor.
-  // During the callback, Add/RemoveObserver will block until the callbacks
-  // are finished. Observers should implement quick callback functions; if
-  // lengthy operations are needed, the observer should take care to invoke
-  // the operation on an appropriate thread.
-  class BASE_EXPORT PowerObserver {
-   public:
-    // Notification of a change in power status of the computer, such
-    // as from switching between battery and A/C power.
-    virtual void OnPowerStateChange(bool on_battery_power) {}
-
-    // Notification that the system is suspending.
-    virtual void OnSuspend() {}
-
-    // Notification that the system is resuming.
-    virtual void OnResume() {}
-
-   protected:
-    virtual ~PowerObserver() {}
-  };
-
   class BASE_EXPORT DevicesChangedObserver {
    public:
     // Notification that the devices connected to the system have changed.
@@ -121,87 +46,26 @@ class BASE_EXPORT SystemMonitor {
   // Add a new observer.
   // Can be called from any thread.
   // Must not be called from within a notification callback.
-  void AddPowerObserver(PowerObserver* obs);
   void AddDevicesChangedObserver(DevicesChangedObserver* obs);
 
   // Remove an existing observer.
   // Can be called from any thread.
   // Must not be called from within a notification callback.
-  void RemovePowerObserver(PowerObserver* obs);
   void RemoveDevicesChangedObserver(DevicesChangedObserver* obs);
 
   // The ProcessFoo() style methods are a broken pattern and should not
   // be copied. Any significant addition to this class is blocked on
   // refactoring to improve the state of affairs. See http://crbug.com/149059
 
-  // Cross-platform handling of a power event.
-  void ProcessPowerMessage(PowerEvent event_id);
-
   // Cross-platform handling of a device change event.
   void ProcessDevicesChanged(DeviceType device_type);
 
  private:
-#if defined(OS_WIN)
-  // Represents a message-only window for power message handling on Windows.
-  // Only allow SystemMonitor to create it.
-  class PowerMessageWindow {
-   public:
-    PowerMessageWindow();
-    ~PowerMessageWindow();
-
-   private:
-    void ProcessWmPowerBroadcastMessage(int event_id);
-    LRESULT CALLBACK WndProc(HWND hwnd, UINT message,
-                             WPARAM wparam, LPARAM lparam);
-    static LRESULT CALLBACK WndProcThunk(HWND hwnd,
-                                         UINT message,
-                                         WPARAM wparam,
-                                         LPARAM lparam);
-    // Instance of the module containing the window procedure.
-    HMODULE instance_;
-    // A hidden message-only window.
-    HWND message_hwnd_;
-  };
-#endif
-
-#if defined(OS_MACOSX)
-  void PlatformInit();
-  void PlatformDestroy();
-#endif
-
-  // Platform-specific method to check whether the system is currently
-  // running on battery power.  Returns true if running on batteries,
-  // false otherwise.
-  bool IsBatteryPower();
-
-  // Checks the battery status and notifies observers if the battery
-  // status has changed.
-  void BatteryCheck();
-
   // Functions to trigger notifications.
   void NotifyDevicesChanged(DeviceType device_type);
-  void NotifyPowerStateChange();
-  void NotifySuspend();
-  void NotifyResume();
 
-  scoped_refptr<ObserverListThreadSafe<PowerObserver> > power_observer_list_;
   scoped_refptr<ObserverListThreadSafe<DevicesChangedObserver> >
       devices_changed_observer_list_;
-  bool battery_in_use_;
-  bool suspended_;
-
-#if defined(ENABLE_BATTERY_MONITORING)
-  base::OneShotTimer<SystemMonitor> delayed_battery_check_;
-#endif
-
-#if defined(OS_IOS)
-  // Holds pointers to system event notification observers.
-  std::vector<id> notification_observers_;
-#endif
-
-#if defined(OS_WIN)
-  PowerMessageWindow power_message_window_;
-#endif
 
   DISALLOW_COPY_AND_ASSIGN(SystemMonitor);
 };
diff --git a/base/system_monitor/system_monitor_android.cc b/base/system_monitor/system_monitor_android.cc
deleted file mode 100644
index f29b7b0..0000000
--- a/base/system_monitor/system_monitor_android.cc
+++ /dev/null
@@ -1,36 +0,0 @@
-// Copyright (c) 2011 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 "base/system_monitor/system_monitor.h"
-#include "jni/SystemMonitor_jni.h"
-
-namespace base {
-
-namespace android {
-
-// Native implementation of SystemMonitor.java.
-void OnBatteryChargingChanged(JNIEnv* env, jclass clazz) {
-  SystemMonitor::Get()->ProcessPowerMessage(SystemMonitor::POWER_STATE_EVENT);
-}
-
-void OnMainActivityResumed(JNIEnv* env, jclass clazz) {
-  SystemMonitor::Get()->ProcessPowerMessage(SystemMonitor::RESUME_EVENT);
-}
-
-void OnMainActivitySuspended(JNIEnv* env, jclass clazz) {
-  SystemMonitor::Get()->ProcessPowerMessage(SystemMonitor::SUSPEND_EVENT);
-}
-
-}  // namespace android
-
-bool SystemMonitor::IsBatteryPower() {
-  JNIEnv* env = base::android::AttachCurrentThread();
-  return base::android::Java_SystemMonitor_isBatteryPower(env);
-}
-
-bool RegisterSystemMonitor(JNIEnv* env) {
-  return base::android::RegisterNativesImpl(env);
-}
-
-}  // namespace base
diff --git a/base/system_monitor/system_monitor_android.h b/base/system_monitor/system_monitor_android.h
deleted file mode 100644
index 9f60560..0000000
--- a/base/system_monitor/system_monitor_android.h
+++ /dev/null
@@ -1,17 +0,0 @@
-// Copyright (c) 2012 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.
-
-#ifndef BASE_SYSTEM_MONITOR_SYSTEM_MONITOR_ANDROID_H_
-#define BASE_SYSTEM_MONITOR_SYSTEM_MONITOR_ANDROID_H_
-
-#include <jni.h>
-
-namespace base {
-
-// Registers the JNI bindings for SystemMonitor.
-bool RegisterSystemMonitor(JNIEnv* env);
-
-}  // namespace base
-
-#endif  // BASE_SYSTEM_MONITOR_SYSTEM_MONITOR_ANDROID_H_
diff --git a/base/system_monitor/system_monitor_ios.mm b/base/system_monitor/system_monitor_ios.mm
deleted file mode 100644
index f3251b6..0000000
--- a/base/system_monitor/system_monitor_ios.mm
+++ /dev/null
@@ -1,40 +0,0 @@
-// Copyright (c) 2012 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 "base/system_monitor/system_monitor.h"
-
-#import <UIKit/UIKit.h>
-
-namespace base {
-
-void SystemMonitor::PlatformInit() {
-  NSNotificationCenter* nc = [NSNotificationCenter defaultCenter];
-  id foreground =
-      [nc addObserverForName:UIApplicationWillEnterForegroundNotification
-                      object:nil
-                       queue:nil
-                  usingBlock:^(NSNotification* notification) {
-                      ProcessPowerMessage(RESUME_EVENT);
-                  }];
-  id background =
-      [nc addObserverForName:UIApplicationDidEnterBackgroundNotification
-                      object:nil
-                       queue:nil
-                  usingBlock:^(NSNotification* notification) {
-                      ProcessPowerMessage(SUSPEND_EVENT);
-                  }];
-  notification_observers_.push_back(foreground);
-  notification_observers_.push_back(background);
-}
-
-void SystemMonitor::PlatformDestroy() {
-  NSNotificationCenter* nc = [NSNotificationCenter defaultCenter];
-  for (std::vector<id>::iterator it = notification_observers_.begin();
-       it != notification_observers_.end(); ++it) {
-    [nc removeObserver:*it];
-  }
-  notification_observers_.clear();
-}
-
-}  // namespace base
diff --git a/base/system_monitor/system_monitor_mac.mm b/base/system_monitor/system_monitor_mac.mm
deleted file mode 100644
index d0dbaab..0000000
--- a/base/system_monitor/system_monitor_mac.mm
+++ /dev/null
@@ -1,98 +0,0 @@
-// Copyright (c) 2012 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.
-
-// Implementation based on sample code from
-// http://developer.apple.com/library/mac/#qa/qa1340/_index.html.
-
-#include "base/system_monitor/system_monitor.h"
-
-#include <IOKit/pwr_mgt/IOPMLib.h>
-#include <IOKit/IOMessage.h>
-
-namespace base {
-
-namespace {
-
-io_connect_t g_system_power_io_port = 0;
-IONotificationPortRef g_notification_port_ref = 0;
-io_object_t g_notifier_object = 0;
-
-void SystemPowerEventCallback(void*,
-                              io_service_t service,
-                              natural_t message_type,
-                              void* message_argument) {
-  SystemMonitor* sys_monitor = SystemMonitor::Get();
-  DCHECK(sys_monitor);
-  switch (message_type) {
-    case kIOMessageSystemWillSleep:
-      sys_monitor->ProcessPowerMessage(SystemMonitor::SUSPEND_EVENT);
-      IOAllowPowerChange(g_system_power_io_port,
-          reinterpret_cast<intptr_t>(message_argument));
-      break;
-
-    case kIOMessageSystemWillPowerOn:
-      sys_monitor->ProcessPowerMessage(SystemMonitor::RESUME_EVENT);
-      break;
-  }
-}
-
-}  // namespace
-
-// The reason we can't include this code in the constructor is because
-// PlatformInit() requires an active runloop and the IO port needs to be
-// allocated at sandbox initialization time, before there's a runloop.
-// See crbug.com/83783 .
-
-// static
-void SystemMonitor::AllocateSystemIOPorts() {
-  DCHECK_EQ(g_system_power_io_port, 0u);
-
-  // Notification port allocated by IORegisterForSystemPower.
-
-  g_system_power_io_port = IORegisterForSystemPower(
-      NULL, &g_notification_port_ref, SystemPowerEventCallback,
-      &g_notifier_object);
-
-  DCHECK_NE(g_system_power_io_port, 0u);
-}
-
-void SystemMonitor::PlatformInit() {
-  // Need to call AllocateSystemIOPorts() before constructing a SystemMonitor
-  // object.
-  DCHECK_NE(g_system_power_io_port, 0u);
-  if (g_system_power_io_port == 0)
-    return;
-
-  // Add the notification port to the application runloop
-  CFRunLoopAddSource(
-      CFRunLoopGetCurrent(),
-      IONotificationPortGetRunLoopSource(g_notification_port_ref),
-      kCFRunLoopCommonModes);
-}
-
-void SystemMonitor::PlatformDestroy() {
-  DCHECK_NE(g_system_power_io_port, 0u);
-  if (g_system_power_io_port == 0)
-    return;
-
-  // Remove the sleep notification port from the application runloop
-  CFRunLoopRemoveSource(
-      CFRunLoopGetCurrent(),
-      IONotificationPortGetRunLoopSource(g_notification_port_ref),
-      kCFRunLoopCommonModes);
-
-  // Deregister for system sleep notifications
-  IODeregisterForSystemPower(&g_notifier_object);
-
-  // IORegisterForSystemPower implicitly opens the Root Power Domain IOService,
-  // so we close it here.
-  IOServiceClose(g_system_power_io_port);
-
-  g_system_power_io_port = 0;
-
-  // Destroy the notification port allocated by IORegisterForSystemPower.
-  IONotificationPortDestroy(g_notification_port_ref);
-}
-
-}  // namespace base
diff --git a/base/system_monitor/system_monitor_posix.cc b/base/system_monitor/system_monitor_posix.cc
deleted file mode 100644
index 6cf01bf..0000000
--- a/base/system_monitor/system_monitor_posix.cc
+++ /dev/null
@@ -1,14 +0,0 @@
-// Copyright (c) 2011 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 "base/system_monitor/system_monitor.h"
-
-namespace base {
-
-bool SystemMonitor::IsBatteryPower() {
-  NOTIMPLEMENTED();
-  return false;
-}
-
-}  // namespace base
diff --git a/base/system_monitor/system_monitor_unittest.cc b/base/system_monitor/system_monitor_unittest.cc
index 43f1dd6..b46e52f 100644
--- a/base/system_monitor/system_monitor_unittest.cc
+++ b/base/system_monitor/system_monitor_unittest.cc
@@ -14,45 +14,9 @@ namespace base {
 
 namespace {
 
-class PowerTest : public SystemMonitor::PowerObserver {
- public:
-  PowerTest()
-      : power_state_changes_(0),
-        suspends_(0),
-        resumes_(0) {
-  }
-
-  // PowerObserver callbacks.
-  virtual void OnPowerStateChange(bool on_battery_power) OVERRIDE {
-    power_state_changes_++;
-  }
-
-  virtual void OnSuspend() OVERRIDE {
-    suspends_++;
-  }
-
-  virtual void OnResume() OVERRIDE {
-    resumes_++;
-  }
-
-  // Test status counts.
-  int power_state_changes() { return power_state_changes_; }
-  int suspends() { return suspends_; }
-  int resumes() { return resumes_; }
-
- private:
-  int power_state_changes_;  // Count of OnPowerStateChange notifications.
-  int suspends_;  // Count of OnSuspend notifications.
-  int resumes_;  // Count of OnResume notifications.
-};
-
 class SystemMonitorTest : public testing::Test {
  protected:
   SystemMonitorTest() {
-#if defined(OS_MACOSX)
-    // This needs to happen before SystemMonitor's ctor.
-    SystemMonitor::AllocateSystemIOPorts();
-#endif
     system_monitor_.reset(new SystemMonitor);
   }
   virtual ~SystemMonitorTest() {}
@@ -63,46 +27,6 @@ class SystemMonitorTest : public testing::Test {
   DISALLOW_COPY_AND_ASSIGN(SystemMonitorTest);
 };
 
-TEST_F(SystemMonitorTest, PowerNotifications) {
-  const int kObservers = 5;
-
-  PowerTest test[kObservers];
-  for (int index = 0; index < kObservers; ++index)
-    system_monitor_->AddPowerObserver(&test[index]);
-
-  // Send a bunch of power changes.  Since the battery power hasn't
-  // actually changed, we shouldn't get notifications.
-  for (int index = 0; index < 5; index++) {
-    system_monitor_->ProcessPowerMessage(SystemMonitor::POWER_STATE_EVENT);
-    EXPECT_EQ(test[0].power_state_changes(), 0);
-  }
-
-  // Sending resume when not suspended should have no effect.
-  system_monitor_->ProcessPowerMessage(SystemMonitor::RESUME_EVENT);
-  RunLoop().RunUntilIdle();
-  EXPECT_EQ(test[0].resumes(), 0);
-
-  // Pretend we suspended.
-  system_monitor_->ProcessPowerMessage(SystemMonitor::SUSPEND_EVENT);
-  RunLoop().RunUntilIdle();
-  EXPECT_EQ(test[0].suspends(), 1);
-
-  // Send a second suspend notification.  This should be suppressed.
-  system_monitor_->ProcessPowerMessage(SystemMonitor::SUSPEND_EVENT);
-  RunLoop().RunUntilIdle();
-  EXPECT_EQ(test[0].suspends(), 1);
-
-  // Pretend we were awakened.
-  system_monitor_->ProcessPowerMessage(SystemMonitor::RESUME_EVENT);
-  RunLoop().RunUntilIdle();
-  EXPECT_EQ(test[0].resumes(), 1);
-
-  // Send a duplicate resume notification.  This should be suppressed.
-  system_monitor_->ProcessPowerMessage(SystemMonitor::RESUME_EVENT);
-  RunLoop().RunUntilIdle();
-  EXPECT_EQ(test[0].resumes(), 1);
-}
-
 TEST_F(SystemMonitorTest, DeviceChangeNotifications) {
   const int kObservers = 5;
 
diff --git a/base/system_monitor/system_monitor_win.cc b/base/system_monitor/system_monitor_win.cc
deleted file mode 100644
index 562b69b..0000000
--- a/base/system_monitor/system_monitor_win.cc
+++ /dev/null
@@ -1,111 +0,0 @@
-// Copyright (c) 2011 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 "base/system_monitor/system_monitor.h"
-
-#include "base/win/wrapped_window_proc.h"
-
-namespace base {
-
-namespace {
-
-const wchar_t kWindowClassName[] = L"Base_PowerMessageWindow";
-
-}  // namespace
-
-// Function to query the system to see if it is currently running on
-// battery power.  Returns true if running on battery.
-bool SystemMonitor::IsBatteryPower() {
-  SYSTEM_POWER_STATUS status;
-  if (!GetSystemPowerStatus(&status)) {
-    DLOG_GETLASTERROR(ERROR) << "GetSystemPowerStatus failed";
-    return false;
-  }
-  return (status.ACLineStatus == 0);
-}
-
-SystemMonitor::PowerMessageWindow::PowerMessageWindow()
-    : instance_(NULL), message_hwnd_(NULL) {
-  WNDCLASSEX window_class;
-  base::win::InitializeWindowClass(
-      kWindowClassName,
-      &base::win::WrappedWindowProc<
-          SystemMonitor::PowerMessageWindow::WndProcThunk>,
-      0, 0, 0, NULL, NULL, NULL, NULL, NULL,
-      &window_class);
-  instance_ = window_class.hInstance;
-  ATOM clazz = RegisterClassEx(&window_class);
-  DCHECK(clazz);
-
-  message_hwnd_ = CreateWindowEx(WS_EX_NOACTIVATE, kWindowClassName,
-      NULL, WS_POPUP, 0, 0, 0, 0, NULL, NULL, instance_, NULL);
-  SetWindowLongPtr(message_hwnd_, GWLP_USERDATA,
-                   reinterpret_cast<LONG_PTR>(this));
-}
-
-SystemMonitor::PowerMessageWindow::~PowerMessageWindow() {
-  if (message_hwnd_) {
-    DestroyWindow(message_hwnd_);
-    UnregisterClass(kWindowClassName, instance_);
-  }
-}
-
-void SystemMonitor::PowerMessageWindow::ProcessWmPowerBroadcastMessage(
-    int event_id) {
-  SystemMonitor::PowerEvent power_event;
-  switch (event_id) {
-    case PBT_APMPOWERSTATUSCHANGE:  // The power status changed.
-      power_event = SystemMonitor::POWER_STATE_EVENT;
-      break;
-    case PBT_APMRESUMEAUTOMATIC:  // Resume from suspend.
-    //case PBT_APMRESUMESUSPEND:  // User-initiated resume from suspend.
-                                  // We don't notify for this latter event
-                                  // because if it occurs it is always sent as a
-                                  // second event after PBT_APMRESUMEAUTOMATIC.
-      power_event = SystemMonitor::RESUME_EVENT;
-      break;
-    case PBT_APMSUSPEND:  // System has been suspended.
-      power_event = SystemMonitor::SUSPEND_EVENT;
-      break;
-    default:
-      return;
-
-    // Other Power Events:
-    // PBT_APMBATTERYLOW - removed in Vista.
-    // PBT_APMOEMEVENT - removed in Vista.
-    // PBT_APMQUERYSUSPEND - removed in Vista.
-    // PBT_APMQUERYSUSPENDFAILED - removed in Vista.
-    // PBT_APMRESUMECRITICAL - removed in Vista.
-    // PBT_POWERSETTINGCHANGE - user changed the power settings.
-  }
-
-  SystemMonitor::Get()->ProcessPowerMessage(power_event);
-}
-
-LRESULT CALLBACK SystemMonitor::PowerMessageWindow::WndProc(
-    HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam) {
-  switch (message) {
-    case WM_POWERBROADCAST: {
-      DWORD power_event = static_cast<DWORD>(message);
-      ProcessWmPowerBroadcastMessage(power_event);
-      return TRUE;
-    }
-    default:
-      break;
-  }
-  return ::DefWindowProc(hwnd, message, wparam, lparam);
-}
-
-// static
-LRESULT CALLBACK SystemMonitor::PowerMessageWindow::WndProcThunk(
-    HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam) {
-  SystemMonitor::PowerMessageWindow* message_hwnd =
-      reinterpret_cast<SystemMonitor::PowerMessageWindow*>(
-          GetWindowLongPtr(hwnd, GWLP_USERDATA));
-  if (message_hwnd)
-    return message_hwnd->WndProc(hwnd, message, wparam, lparam);
-  return ::DefWindowProc(hwnd, message, wparam, lparam);
-}
-
-}  // namespace base