Follow source maps when jumping to definition

[rictic]

If a jump to definition request leads us to a file with a source map, it'd be a pretty neat trick if we parsed that source map and followed the jumped-to location to the original definition

[tedium-bot]

Issue migrated to polymer/tools#483

[aomarks]

Re-opening because this original issue is now transferred and canonical again.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[stale]

This issue has been automatically closed after being marked stale. If you're still facing this problem with the above solution, please comment and we'll reopen!