commit a57ce77c1e7c0e7c1caa825e3f8ca204c3e5900a
author Alex Deymo <deymo@google.com> Fri May 13 20:07:51 2016 -0700
committer Alex Deymo <deymo@google.com> Mon May 16 20:11:38 2016 +0000
tree 4639d2802d1c91ea31969c131580b3955f0357da
parent 3d0090674394076d6f998fc27f60b041e5718904

payload_generator: Mark all zero blocks in the old partition as visited.

When processing duplicated and zeroed blocks, discard all the zeroed
blocks from the source partition since it doesn't make sense to waste
I/O reading them, and all the new zeroed blocks are taken care of in a
different way.

This also solves the problem that those zeroed blocks might actually not
be written in the source slot when flashing an image with fastboot.

Bug: 28626303
TEST=deployed an update on a device after flashing it with fastboot.

Change-Id: I42012a84634a5b35f181b6b22e8a738ba3b70957