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Android GN builds have been unable to build raw "unit_tests" as a target,
instead relying on unit_tests_apk or chrome/test:unit_tests. Linux builds,
in contrast, can do so without issue. I had thought that the issue was
that a "unit_tests" gn target in another directory was preventing gn
from creating a top-level alias. While this may be true, it's not the
reason for the discrepancy between Android and Linux builds. Instead,
the difference is that Linux builds create a unit_tests executable in
the top-level output directory, while Android builds create an APK and
a wrapper script in child directories.

This CL writes an additional wrapper script for gtest targets on Android
in the top-level directory that matches the suite's output_name (usually
its target name), allowing us to successfully build raw "unit_tests" on
Android. As a bonus, we can now run

  $ out/Release/unit_tests

(etc) on Android.

BUG=716117

Review-Url: https://codereview.chromium.org/2851523002
Cr-Commit-Position: refs/heads/master@{#469485}