tree ef926fe40c06234bae5a3aa271d1095ec68bcfb2
parent 1a69fc00908a00bbcd182d362248c8ba71f8c620
author chaviw <chaviw@google.com> 1567539622 -0700
committer chaviw <chaviw@google.com> 1567539622 -0700

Use getLayerStack() instead of layerStack for input info

When there's no displayId, the layerStack should be used. The current
code was using mDrawingState.layerStack which is incorrect because only
the layerStack for the root of the tree is correct. Instead, use
getLayerStack() which traverses the hierarchy to find the root's
layerStack.

Test: Uses correct layerStack instead of 0 for input with unset displayIds
Change-Id: Ic8a06c562e970b0f328c539edfa51e206734934f