Include pid in message with --wait-for-debugger in mojo
Include pid in message with --wait-for-debugger in mojo

This makes it easier to know what to connect to.

BUG=none
TEST=none
R=ben@chromium.org

Review URL: https://codereview.chromium.org/1499163004

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#363500}

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