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This CL changes the GN blink_web_tests and blink_python_tests
targets to use a new script_test() GN template.

A script_test is a kind of test target that implements the
[test executable API](//docs/testing/test_executable_api.md)
via a Python script (rather than being an executable target).

:blink_web_tests, :blink_python_tests are examples of this type
of test; other targets will be switched over in future CLs as well.

Most importantly, using script_test() will ensure that
the $root_build_dir/bin/run_$target_name test wrappers are
generated with all of the appropriate arguments, simplifying the
invocation of the test both for devs and for the bots.

Bug: 816629
Change-Id: Ib4bfd2342d762db24cdef75b64ed5dd7fbf3c10e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2380936
Commit-Queue: Dirk Pranke <dpranke@google.com>
Reviewed-by: Robert Ma <robertma@chromium.org>
Reviewed-by: Rakib Hasan <rmhasan@google.com>
Cr-Commit-Position: refs/heads/master@{#812523}