[test] Increase timeout for tests run by predictable_wrapper.py.

R=machenbach@chromium.org, sigurds@chromium.org

Bug: v8:7551
Change-Id: If7aca6477acc86eddd2ca7d96a8b222dca9298c2
Reviewed-on: https://chromium-review.googlesource.com/960662Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Commit-Queue: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#51917}

tools/predictable_wrapper.py

@@ -19,6 +19,7 @@ import sys
 from testrunner.local import command
 
 MAX_TRIES = 3
+TIMEOUT = 120
 
 def main(args):
   def allocation_str(stdout):
@@ -27,7 +28,7 @@ def main(args):
         return line
     return None
 
-  cmd = command.Command(args[0], args[1:])
+  cmd = command.Command(args[0], args[1:], timeout=TIMEOUT)
 
   previous_allocations = None
   for run in range(1, MAX_TRIES + 1):