Inline scripts share the same URL, so lookup of script by URL on them
can give the wrong result. Also, their source positions are relative to
the start of the HTML file, so we need to infer the starting line from
the Script's compilation event.

As a drive-by, fix the tooltip to lock in-place on click.

Change-Id: I5db6d35b0fbd2521531e48c34dea44b43b65ca4a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2963592
Auto-Submit: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Camillo Bruni <cbruni@chromium.org>
Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#75153}