android: Make out_dir an absolute path

Add debug output to show the output dir that is used. Ensure that debug
output is shown locally by explicitly configuring logging.

Also restore the previous behaviour of passing in "." as the output
directory, as the script is run from the output directory. Using an
absolute path ensures that other scripts use the correct output
directory regardless of whether they set their own cwd or not, since
//tools/cygprofile/android_profile_tool.py runs run_benchmark from the
root dir while //tools/cybprofile/symbol_extractor tries to find
libmonochrome_64.so without setting its own cwd (so it defaults to the
out dir).

R=martinkong@google.com

Bug: 409547501
Change-Id: I5a09352ea583ee04b5f19efe2ad2e54a052377b0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6442355
Auto-Submit: Peter Wen <wnwen@chromium.org>
Commit-Queue: Martin Kong <martinkong@google.com>
Reviewed-by: Martin Kong <martinkong@google.com>
Commit-Queue: Peter Wen <wnwen@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1444814}