tree ddd4f9bf6be614acd2a50b0313faeecd63510fe9
parent 28be2bdbe40e39b22d4acc882506081afa3dcf5d
author Robert Carr <racarr@google.com> 1449110385 -0800
committer Robert Carr <racarr@google.com> 1449516035 -0800

Move surface save state tracking to WindowState.

In the current set up, surface saving is managed by the app window
token. So when destroySavedSurfaces is called, all saved surfaces
assosciated with a given app will be destroyed. This causes pretty weird
behavior where hiding child windows can destroy the parent window. We
move this tracking to WindowState and allow child windows to exempt themselves.

Bug: 25780116
Change-Id: I3ab92221d83297092dfd98a71e6a5fe96381de8b