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Moved unit test delegate to general test launcher tests
to share results file parsing.

Added test for unit test delegate and test launcher to
launch 3 tests, and validate their results.

Windows versions prior to Windows 8 required a new flag
'dont-use-job-objects' to avoid unsupported nested job objects.

This test is more comprehensive, and also tests
the gtest xml results parsing of the delegate.

Bug: 936244
Change-Id: I28afe983f8960c366f9b61a22c05103b32fafaa2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1732885
Commit-Queue: Ilia Samsonov <isamsonov@google.com>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Erik Chen <erikchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#685211}