commit c3ae67c35590ce0ed05e70599fdc29633e9f700c
author David Zeuthen <zeuthen@google.com> Thu Apr 21 17:02:30 2016 -0400
committer David Zeuthen <zeuthen@google.com> Fri Apr 22 14:59:18 2016 -0400
tree 8fa6f170a890a6510770d493f5a0b400f7eff312
parent d6a6e0243af0d448170c2c10c31c9ae9e22dab0e

Add 'position' attribute to influence the sequence of partitions.

This makes it possible to put vendor partitions in front of the
pre-defined Brillo partitions. This may be needed by some boot loaders.

Also make it permissible to omit the 'type_guid' attribute by defaulting
to 'brillo_vendor_specific' if omitted.

Slightly rework FakeGuidGenerator to ensure that we get stable GUIDs for
A/B partitions when feeding its output back into itself (idempotence).

TEST=New unit test + unit tests pass.
BUG=28252419

Change-Id: I7a8e18449a5f16105f429abf0fb6114a3b358fea