feat: add thermal states to powerMonitor (#38027)

* feat: add thermal states to powerMonitor

Co-authored-by: Jeremy Rose <jeremya@chromium.org>

* update docs

Co-authored-by: Jeremy Rose <jeremya@chromium.org>

---------

Co-authored-by: trop[bot] <37223003+trop[bot]@users.noreply.github.com>
Co-authored-by: Jeremy Rose <jeremya@chromium.org>

lib/browser/api/power-monitor.ts

@@ -5,6 +5,7 @@ const {
   createPowerMonitor,
   getSystemIdleState,
   getSystemIdleTime,
+  getCurrentThermalState,
   isOnBatteryPower
 } = process._linkedBinding('electron_browser_power_monitor');
 
@@ -43,6 +44,10 @@ class PowerMonitor extends EventEmitter {
     return getSystemIdleState(idleThreshold);
   }
 
+  getCurrentThermalState () {
+    return getCurrentThermalState();
+  }
+
   getSystemIdleTime () {
     return getSystemIdleTime();
   }