Adapt ActionBar.LayoutParams to Toolbar.LayoutParams on demand

When Toolbar is acting in the role of an action bar it needs to handle
the case where app code calls setLayoutParams on a custom view with an
ActionBar.LayoutParams instance. Run the newly set LayoutParams
through the check/generate routine normally performed when adding a
child view whenever LayoutParams are set on an existing child to
correct for it.

This might not be a bad thing to generalize someday but it would make
for very confusing compatibility behavior when running code that
was written to expect it on older platform versions.

Bug 16219488

Change-Id: I568a335fe8ebbbaa666690d1f0e95f313abd2f1e