tree 0f21f800c29c4a3602b649bb168a09d123305cce
parent 08fadf196ada28ed3fd400223d5045b3b195316c
author John Reck <jreck@google.com> 1485195867 -0800
committer gitbuildkicker <android-build@google.com> 1485211272 -0800

Add missing nothingToDraw() check

Fixes: 34598346

Prior to 2874daa4d38bddd3a5f0edb3774d5e5884dd9554 we
never freed the resources of root nodes. Now that this is being
done we need to ensure that the backdrop has content before
we try to draw that content. All other nodes passed in
deferRenderNodeScene check that nothingToDraw() returns false
before drawing them, but that check was missed on the backdrop
node.

Test: manual. open calculator then long-press on recents
Change-Id: I495749161b38b57278bdb60d5f872eeeb2b218d0
(cherry picked from commit 51c51df46c1d8bbbd946dc2dde429ae91b29d47e)