Bug 1898057 - actually record how much energy was used per process type on Apple Silicon, r=chutten.

Differential Revision: https://phabricator.services.mozilla.com/D211760

toolkit/components/glean/ipc/FOGIPC.cpp

@@ -414,6 +414,7 @@ void RecordPowerMetrics() {
 
 #ifdef HAS_PROCESS_ENERGY
   if (newProcessEnergy) {
+    power::energy_per_process_type.Get(type).Add(newProcessEnergy);
     PROFILER_MARKER("Process Energy", OTHER, {}, ProcessEnergyMarker,
                     newProcessEnergy, type);
     previousProcessEnergy += newProcessEnergy;