Merge \"Consume the first sample of KernelUidCpuTimeReader\" into nyc-dev

am: e5417a3863

Change-Id: I67f604fbacba0efb95ff01b2de5bd7799eb8c3d9

core/java/com/android/internal/os/KernelUidCpuTimeReader.java

@@ -84,7 +84,8 @@ public class KernelUidCpuTimeReader {
                     powerMaUs = 0;
                 }
 
-                if (callback != null) {
+                // Only report if there is a callback and if this is not the first read.
+                if (callback != null && mLastTimeReadUs != 0) {
                     long userTimeDeltaUs = userTimeUs;
                     long systemTimeDeltaUs = systemTimeUs;
                     long powerDeltaMaUs = powerMaUs;