use same cpu stats readers with BatteryStats so that
1) both throttle to avoid too frequent pulls
2) cached value is served within throttle interval to avoid double
pulling by both statsd and BatteryStats
To run unit tests:
bit FrameworksCoreTests:com.android.internal.os.KernelUidCpuFreqTimeReaderTest
bit FrameworksCoreTests:com.android.internal.os.KernelUidCpuClusterTimeReaderTest
bit FrameworksCoreTests:com.android.internal.os.KernelUidCpuActiveTimeReaderTest
make -j56 statsd_test && adb sync data && adb shell /data/nativetest64/statsd_test/statsd_test
Test: cts test, unit test
Fix: 73745189
Fix: 73780619
Fix: 73360959
Change-Id: I10a9bc91ca67fa812f4cd71c4fbd73c1a5ba580e
f248047d74