Pass FROM_HERE to ObserverListThreadSafe::Notify to improve profile.

base/power_monitor/power_monitor.cc

Index: base/power_monitor/power_monitor.cc
diff --git a/base/power_monitor/power_monitor.cc b/base/power_monitor/power_monitor.cc
index 14dc4b517832785c07153abfed2bcc4a3a738940..98c9c68c1dfae151f7252b816103af14d5f09e9f 100644
--- a/base/power_monitor/power_monitor.cc
+++ b/base/power_monitor/power_monitor.cc
@@ -45,17 +45,18 @@ bool PowerMonitor::IsOnBatteryPower() {
 void PowerMonitor::NotifyPowerStateChange(bool battery_in_use) {
   DVLOG(1) << "PowerStateChange: " << (battery_in_use ? "On" : "Off")
            << " battery";
-  observers_->Notify(&PowerObserver::OnPowerStateChange, battery_in_use);
+  observers_->Notify(FROM_HERE, &PowerObserver::OnPowerStateChange,
+                     battery_in_use);
 }
 
 void PowerMonitor::NotifySuspend() {
   DVLOG(1) << "Power Suspending";
-  observers_->Notify(&PowerObserver::OnSuspend);
+  observers_->Notify(FROM_HERE, &PowerObserver::OnSuspend);
 }
 
 void PowerMonitor::NotifyResume() {
   DVLOG(1) << "Power Resuming";
-  observers_->Notify(&PowerObserver::OnResume);
+  observers_->Notify(FROM_HERE, &PowerObserver::OnResume);
 }
 
 }  // namespace base