[test] Prepare removing timeout config on infra side.

This prepares removing the special timeout of 200 on the bots. First
we temporarily set 200 on v8 side to remove the flag on the infra side.
Afterwards we'll remove the v8-side code, tested in CQ.

TBR=tmrts@chromium.org

Bug: v8:9145
Change-Id: I61578da02ab8c101d0d6c916106ad5a8bc6841cb
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1581259Reviewed-by: Tamer Tas <tmrts@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60962}

tools/testrunner/base_runner.py

@@ -693,6 +693,10 @@ class BaseTestRunner(object):
     }
 
   def _create_test_config(self, options):
+    # TODO(machenbach): Remove temporary hard-coded timeout when infra side is
+    # removed.
+    if options.buildbot:
+      options.timeout = 200
     timeout = options.timeout * self._timeout_scalefactor(options)
     return TestConfig(
         command_prefix=options.command_prefix,