Disable TimeTicks.ThreadNow on Android

TimeTicks.ThreadNow is flaky on Android

[----------] 1 test from TimeTicks
[ RUN      ] TimeTicks.ThreadNow
../../base/time/time_unittest.cc:692: Failure
Expected: (delta_thread.InMicroseconds()) > (0), actual: 0 vs 0
[  FAILED  ] TimeTicks.ThreadNow (10 ms)
[----------] 1 test from TimeTicks (11 ms total)

E.g. failing 13 times on March 13th.
http://chromium-build-logs.appspot.com/gtest_query?gtest_query=TimeTicks.ThreadNow

BUG=352633
NOTRY=true
TBR=scheib@chromium.org

Review URL: https://codereview.chromium.org/197313011

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@257111 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 257111
Mojo: Add a simple child process launcher to the Mojo shell code.

R=sky@chromium.org

Review URL: https://codereview.chromium.org/196023013

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@257112 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 257112