tast: Increase timeout of informational-chrome to 2hr.

Recently tast.informational-chrome is hitting 1hr timeout on some
boards.

https://goto.google.com/kqxnd

While we debug the slowness, let us increase the timeout to
make tests run.

BUG=b:138819533
TEST=CQ

Change-Id: I56814fd05cd1e87c5972496203224309e6a0a9ae
Reviewed-on: https://chromium-review.googlesource.com/1731234
Tested-by: Shuhei Takahashi <nya@chromium.org>
Commit-Ready: Shuhei Takahashi <nya@chromium.org>
Legacy-Commit-Queue: Commit Bot <commit-bot@chromium.org>
Reviewed-by: Keiichi Watanabe <keiichiw@chromium.org>
Reviewed-by: Shuo-Peng Liao <deanliao@chromium.org>
diff --git a/server/site_tests/tast/control.informational-chrome b/server/site_tests/tast/control.informational-chrome
index 268b93f..ccc1288 100644
--- a/server/site_tests/tast/control.informational-chrome
+++ b/server/site_tests/tast/control.informational-chrome
@@ -32,6 +32,6 @@
                  test_exprs=['(!disabled && !"group:*" && informational && '
                              '"dep:chrome" && !"dep:android" && '
                              '!"dep:android_all")'],
-                 ignore_test_failures=True, command_args=args)
+                 ignore_test_failures=True, max_run_sec=7200, command_args=args)
 
 parallel_simple(run, machines)