findViewWithText inconsistent with other findView* methods and...

findViewWithText inconsistent with other findView* methods and AccessibilityNodeInfo not respecting root namespace.

1. Find viewsWithText does  not respect if the current view  group is a root name
   space and keeps its traversal. This is inconsistent with the other findView*
   methods. Also only visible views are returned witch is inconsistent with the other
   findView* methods.

2. AccessibilityNodeInfo reports children it the source is root namespace. This is
   not correct since thi flag denotes the beginning of a logically separate view
   hierarchy.

bug:5082601

Change-Id: I9c7ca51f284d04728828d5e656112257c9a2c6e2