Semantics for "--build-directory" in run_web/wpt_tests.py has changed

[Weizhong Xia]

TL;DR: "--build-directory" now should point to the full path of the build directory, e.g. "out/Default"

Hello Blink Developers,

This is a belated PSA. We recently made a change to "--build-directory" to let it point to the full path of the build directory, so instead of using something like "--build-directory=your-out-dir -t your-target-dir", you should use "--build-directory=your-out-dir/your-target-dir", and "-t" is not needed in this case (assuming you are at chromium/src). This way we make the semantics for "--build-directory" consistent with other scripts used in Chromium, and hopefully save some typing in this case.

"--target" or "-t" should continue to work as usual if your target directory is under "out".

Please refer to crrev.com/c/5992459 for the background.

Thanks, Weizhong

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