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/gen/ is already available in both file tests (via blink_test_runner.cc)
and http tests (via Apache 'Alias' directives). This CL makes /gen/ also
available to wptserve in Blink (both run_web_tests and
run_blink_wptserve).

Besides, this CL adds configuration options (release, debug, etc.) to
run_blink_wptserve so that users can control which out/*/gen is served.

Also fix a leaking file descriptor in filesystem.open_text_tempfile.

Bug: 821496
Change-Id: I60ae0657df470dd319d002bc1c20476d33d9c05e
Reviewed-on: https://chromium-review.googlesource.com/1140908
Commit-Queue: Robert Ma <robertma@chromium.org>
Reviewed-by: Quinten Yearsley <qyearsley@chromium.org>
Reviewed-by: Philip Jägenstedt <foolip@chromium.org>
Cr-Commit-Position: refs/heads/master@{#576210}