Allow targets to override the output directory.
Allow targets to override the output directory.

This uses the new output_dir override of GN (see https://codereview.chromium.org/1887533003) in the tool definitions to allow targets to override this location.

Review URL: https://codereview.chromium.org/1882973002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#387432}

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