Introduced WindowContainer.hasContentToDisplay
We have lots of "is visible" methods and this change is an attempt
to rename one of the methods to match closer to what is actually does
and differentiate it from other "is visible" methods.
WC.hasContentToDisplay() returns true if the container or one of its
children as some content it can display or wants to display
(e.g. app views or saved surface).
WC.isVisible() returns true if the container or one of its children
is considered visible from the WindowManager perspective which usually
means valid surface and some other internal state are true.
Bug: 30060889
Change-Id: Ifbd6c277eb65a53b8035b6f34fc45196962632c1
7 files changed