Other improvements for bug #6427629 Clean up layout direction APIs

- hide isLayoutRtl() from public API

- canResolveXXX() is now smarter: use recursion to get its returned value

- in ViewGroup, if resolution cannot be done then dont ask resolution for
its children

- in ViewGroup, addViewInner() needs to ask to resolve the child. This is
needed for example by ListView which is using the same measurespec before
and after its childs being attached.

It also take care of the general case where a measure pass is done when not
attached to a parent (and thus asking for resolution that will "fail" if we
are using IHNERIT) and never done again. That would lead to never do a
resolution.

- some code refactoring

Change-Id: I120dd2fef7397944f5ba8deff0686b108dc827d2