Fire SystemMonitor::{RESUME,SUSPEND}_EVENT on Android.

base/system_monitor/system_monitor_android.cc

 // 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) {
+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