Update accessibility compat classes for N.

Adding getTitle and getAnchor to AccessibilityWindowInfoCompat.

Adding getDrawingOrder, setDrawingOrder, isImportantForAccessibility,
and setImportantForAccessibility to AccessibilityNodeInfoCompat.

Bug: 28912621
Change-Id: I6980f63c193bac872cee1a07a16ad922b559e88d
4 files changed