tree 12c72f2b6de023b3a8512c24c17b2f33f78fa06f
parent af1575fc52d529436856ecbce3c3cd0593016b25
author Alex Deymo <deymo@google.com> 1446855110 -0800
committer Alex Deymo <deymo@google.com> 1447128389 -0800

Return the error reason to the caller of SetTargetChannel.

This patch sends back to the caller an error message indicating why the
channel change didn't work.

Bug: 25595865
Test: Deployed on a device and attempted to change to "foo" channel. Error message lists available channels.
Test: FEATURES=test emerge-link update_engine

Change-Id: Idcc67d5c7878ce7af60652d7bf5bf81135325f97