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

base/system_monitor/system_monitor_android.cc

Index: base/system_monitor/system_monitor_android.cc
diff --git a/base/system_monitor/system_monitor_android.cc b/base/system_monitor/system_monitor_android.cc
index 4e1a16b3e91f379f26bd829b55f62f08ca9cba46..f29b7b0380279ac59461f02369142a687a24c297 100644
--- a/base/system_monitor/system_monitor_android.cc
+++ b/base/system_monitor/system_monitor_android.cc
@@ -10,11 +10,18 @@ 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() {