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This allows supersize to analyze split APKs. These show up as child
containers to the base APK since they are named with
"<base name>/<split name>".

Example report: https://chrome-supersize.firebaseapp.com/viewer.html?load_url=https%3A%2F%2Fstorage.googleapis.com%2Fchrome-supersize%2Foneoffs%2Fcduvall7.size&group_by=container&type=mx
Example diff: https://chrome-supersize.firebaseapp.com/viewer.html?load_url=https%3A%2F%2Fstorage.googleapis.com%2Fchrome-supersize%2Foneoffs%2Fcduvall4.sizediff&group_by=container&type=mx&diff_mode=on

Bug: 1143690
Change-Id: I6ed7d516607e56431cf4c3fb67989d6783520a78
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2614123
Commit-Queue: Clark DuVall <cduvall@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841627}