Cleanup / fixes for CTS DebugTest.

First, remove a lot of the unused old annotations and empty test methods.

Then, rewrite test for Debug.threadCpuTimeNanos, which had lots of problems as detailed in the bug.

The new simple version:

-Fires off a new thread and waits for it to complete
-In that thread, do some work and verify that the cpu time has increased

Bug: 5387112
Change-Id: I9b67db7855133bafbcaa203c6e4c483ea770aad8
1 file changed