Re-enable last remaining key_silk_cases tests on Android

Did not see any problems running these two tests locally for a few
hours.

BUG=355952
TBR=tonyg@chromium.org

Review URL: https://codereview.chromium.org/302313002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@274484 0039d316-1c4b-4281-b951-d872f2087c98

tools/perf/benchmarks/thread_times.py

@@ -7,7 +7,6 @@ from benchmarks import silk_flags
 from measurements import thread_times
 
 
-@test.Disabled('android')  # crbug.com/355952
 class ThreadTimesKeySilkCases(test.Test):
   """Measures timeline metrics while performing smoothness action on key silk
   cases."""
@@ -16,7 +15,6 @@ class ThreadTimesKeySilkCases(test.Test):
   options = {"report_silk_results": True}
 
 
-@test.Disabled('android')  # crbug.com/355952
 class ThreadTimesFastPathKeySilkCases(test.Test):
   """Measures timeline metrics while performing smoothness action on key silk
   cases using bleeding edge rendering fast paths."""