We had a test failure:

nnapi-0.0.2-r3: Expected: (endUptimeMs - startUptimeMs) < (SLEEP_MS + SLACK_MS), actual: 555 vs 550

Increasing the slack time to account for when the test might be run under heavy load.

diff --git a/platform2/aosp/system/core/libutils/SystemClock_test.cpp b/platform2/aosp/system/core/libutils/SystemClock_test.cpp
index 7449dad..821c295 100644
--- a/platform2/aosp/system/core/libutils/SystemClock_test.cpp
+++ b/platform2/aosp/system/core/libutils/SystemClock_test.cpp
@@ -24,7 +24,7 @@ static const auto MS_IN_NS = 1000000;
 static const int64_t SLEEP_MS = 500;
 static const int64_t SLEEP_NS = SLEEP_MS * MS_IN_NS;
 // Conservatively assume that we might be descheduled for up to 50 ms
-static const int64_t SLACK_MS = 50;
+static const int64_t SLACK_MS = 100;
 static const int64_t SLACK_NS = SLACK_MS * MS_IN_NS;
 
 TEST(SystemClock, SystemClock) {