Add --output-dir, CHROMIUM_OUTPUT_DIR to adb_gdb
Add --output-dir, CHROMIUM_OUTPUT_DIR to adb_gdb

Most other scripts support these already.

BUG=573345

Review URL: https://codereview.chromium.org/1559573003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#368252}

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