Return image address in image info so it can be shown in dropdown.

Note that I don't dereference this pointer, I'm just showing it to the user as it is currently
the only common identifier between the command list and the resource tab.

A longer term fix would be to show the resourse tab's indices in the command list. this is tougher
because it involves replacing UrlDataManager without breaking skiaserve.

Change-Id: Iaa0d60831e96128f19b6358e82b2e89f80444927
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/258800
Reviewed-by: Kevin Lubick <kjlubick@google.com>
Commit-Queue: Nathaniel Nifong <nifong@google.com>
2 files changed