imports: prefer paths imported by sibling files.

Adds an Imports field to packageInfo with the imports used by sibling
files, and uses it preferentially if it matches a missing import.

Example: if foo/foo.go imports "local/log", it's a reasonable assumption
that foo/bar.go will also want "local/log" instead of "log".

Change-Id: Ifb504ed5e00ff18459f19d8598cc2c94099ae563
Run-TryBot: Brad Fitzpatrick <>
Reviewed-by: Brad Fitzpatrick <>
2 files changed