Fix timestamps sort in UiAutomationTest.testWindowContentFrameStats

During verification, timestamps are expected to be in ascending order
however if there are two identical timestamps, the test still fails.

Fixed by modifying the comparison scope.

Bug=25804581

Change-Id: Icdda1340ce32440588caf47e21d75f645e7bc6f1
(cherry picked from commit c13ee9af0d241b3e8fabf25b00cc86f408ee3058)
1 file changed