[Sheriff] Mark flaky webkit tests.

BUG=v8:2989
R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/66163004

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@17604 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

test/webkit/webkit.status

@@ -26,6 +26,13 @@
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 [
+[ALWAYS, {
+  ##############################################################################
+  # Flaky tests.
+  # BUG(v8:2989).
+  'dfg-inline-arguments-become-int32': [PASS, FLAKY],
+  'dfg-inline-arguments-reset': [PASS, FLAKY],
+}],  # ALWAYS
 ['mode == debug', {
   # Too slow in debug mode.
   'dfg-int-overflow-in-loop': [SKIP],