Add missing Gauge Increment

Author: tejasd

firebase-perf/src/main/java/com/google/firebase/perf/session/gauges/CpuGaugeCollector.java

@@ -186,6 +186,7 @@ private synchronized void scheduleCpuMetricCollectionOnce(Timer referenceTime) {
                 CpuMetricReading currCpuReading = syncCollectCpuMetric(referenceTime);
                 if (currCpuReading != null) {
                   cpuMetricReadings.add(currCpuReading);
+                  GaugeCounter.INSTANCE.incrementCounter();
                 }
               },
               /* initialDelay */ 0,

firebase-perf/src/main/java/com/google/firebase/perf/session/gauges/MemoryGaugeCollector.java

@@ -149,6 +149,7 @@ private synchronized void scheduleMemoryMetricCollectionOnce(Timer referenceTime
                 AndroidMemoryReading memoryReading = syncCollectMemoryMetric(referenceTime);
                 if (memoryReading != null) {
                   memoryMetricReadings.add(memoryReading);
+                  GaugeCounter.INSTANCE.incrementCounter();
                 }
               },
               /* initialDelay */ 0,