Fix issue in CpuTimePerUid where microseconds are used as milliseconds

KernelUidCpuTimeReader reads microseconds, but they are written to a
millisecond field in atoms.proto. Introduced in ag/3693225.

See google3 change: cl/222044203

Test: build
Bug: 119853118
Change-Id: I170e996aa852e28a246a98226677907bb3560371
1 file changed
tree: e885f106427b99fec6df7626d080b21c3520c6e9
  1. stats/