liblog: Refactor log_wrap_test

The prior unit test reads MAIN buffer with ANDRID_LOG_WRAP flag.
But the reading thread wakes up when the MAIN buffer is full.
The MAIN buffer is usually filled less than 5 seconds.
For example, the cf_x86_64_phone-userdebug target.
So we switch to read SYSTEM buffer, which is stuffed much slower.

Bug: 197901557
Test: CtsLiblogTestCases
Change-Id: Ib53cc25469d2049f362a019c36bdd30f9e634b15
1 file changed
tree: 091e914eda789a5c804f2d5aa7e46151aea94dfd
  1. liblog/
  2. logcat/
  3. logd/
  4. logwrapper/
  5. rust/
  6. OWNERS
  7. PREUPLOAD.cfg
  8. TEST_MAPPING