Adds an iOS implementation of base::SystemMonitor.

BUG=None
TEST=None


Review URL: https://chromiumcodereview.appspot.com/10703120

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@145929 0039d316-1c4b-4281-b951-d872f2087c98

base/base.gypi

@@ -348,6 +348,7 @@
           'system_monitor/system_monitor.cc',
           'system_monitor/system_monitor.h',
           'system_monitor/system_monitor_android.cc',
+          'system_monitor/system_monitor_ios.mm',
           'system_monitor/system_monitor_mac.mm',
           'system_monitor/system_monitor_posix.cc',
           'system_monitor/system_monitor_win.cc',
@@ -575,7 +576,6 @@
               ['exclude', '^json'],
               ['exclude', '^message_pump'],
               ['exclude', '^process_util'],
-              ['exclude', '^system_monitor'],
               ['exclude', '^values'],
             ],
           }],

base/system_monitor/system_monitor.h

@@ -27,10 +27,14 @@
 #include "base/timer.h"
 #endif  // defined(ENABLE_BATTERY_MONITORING)
 
-#if defined(OS_MACOSX)
+#if defined(OS_MACOSX) && !defined(OS_IOS)
 #include <IOKit/pwr_mgt/IOPMLib.h>
 #include <IOKit/IOMessage.h>
-#endif  // OS_MACOSX
+#endif  // OS_MACOSX && !OS_IOS
+
+#if defined(OS_IOS)
+#include <objc/runtime.h>
+#endif  // OS_IOS
 
 class FilePath;
 
@@ -65,8 +69,12 @@ class BASE_EXPORT SystemMonitor {
   //
   // 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();
-#endif
+#else
+  static void AllocateSystemIOPorts() {}
+#endif  // OS_IOS
+#endif  // OS_MACOSX
 
   //
   // Power-related APIs
@@ -189,6 +197,11 @@ class BASE_EXPORT SystemMonitor {
   base::OneShotTimer<SystemMonitor> delayed_battery_check_;
 #endif
 
+#if defined(OS_IOS)
+  // Holds pointers to system event notification observers.
+  std::vector<id> notification_observers_;
+#endif
+
   MediaDeviceMap media_device_map_;
 
   DISALLOW_COPY_AND_ASSIGN(SystemMonitor);

base/system_monitor/system_monitor_ios.mm

+// 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