For inline scripts that have a `// #sourceURL=foo.js` annotation, the
V8 inspector (and by extension `Error.stack`) currently operates in
terms of the `foo.js`, i.e. doesn't give any hint about the actual
source, except for the line/column offsets reported upon scriptParsed.
However in case of stack frames (i.e. as part of `Error.stack` or as
part of the call frames reported via CDP), the line/column offsets are
relative to the actual source instead of relative to the `foo.js` part,
which - besides other things - makes post-processing of recorded stack
traces tricky (sometimes impossible).

This change adjusts the source positions reported for (inline) scripts
with sourceURL annotations to be relative to the (inline) script instead
of the surrounding document.

Bug: chromium:1183990
Fixed: chromium:578269
Change-Id: I74f2b93c22ec43ca796b6b51faa9df5b99cf03f9
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3069289
Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
Auto-Submit: Benedikt Meurer <bmeurer@chromium.org>
Reviewed-by: Simon Zünd <szuend@chromium.org>
Cr-Commit-Position: refs/heads/master@{#76097}