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This CL includes several improvements to autotest.py:
-Slightly expand the GTest regex.
  -Previously, it missed some tests due to them not explicitly including
    gtest via #include "...gtest.h". Variations included <...gtest.h>,
    gmock.h, or via *test_utils.h. Expand the regex to include these
    cases.
  -In my (limited) testing I didn't see any large regressions in terms
    of number of files added via the expanded regex, but its possible
    there is something I missed.
-Add utf-8 encoding when opening a file to read.
  -This avoids errors when opening files with non-English characters.
-Debugging lines to output all files that matched the regex.
-Added sys.executable to beginning of call to make-gtest-filter.py.
  -This enables it to work on Windows, which requires 'python3' before
    calling a python script.

Change-Id: Ic9e67658b7298867d997ba4cc396320bf5d61c8c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2517944Reviewed-by: Michael Thiessen <mthiesse@chromium.org>
Commit-Queue: Mario Bianucci <mabian@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#824031}