Accessibility window query APIs should respect root name space.

1. The window query API used to not-respect the root name space
   while traversing the parent relation i.e. a client was able
   to fetch the parent of a root name space node.

2. Children that are root name space were reported but their descendants
   not. Actually such children should not be reported since they are
   the root of a separate logical sub-tree. Such a tree is exposed by
   its root allowing its traversal. The accessibility APIs should be
   able to explore a virtual tree, i.e. one with a descendant which is
   root name space, only if an accessibility event from there was received.

bug:5480096

Change-Id: I4c4d805aa2f6d4edba86eda213b5239bea83eed2

Author: sganov

core/java/android/view/View.java

@@ -4122,10 +4122,12 @@ void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) {
         bounds.offset(locationOnScreen[0], locationOnScreen[1]);
         info.setBoundsInScreen(bounds);
 
-        ViewParent parent = getParent();
-        if (parent instanceof View) {
-            View parentView = (View) parent;
-            info.setParent(parentView);
+        if ((mPrivateFlags & IS_ROOT_NAMESPACE) == 0) {
+            ViewParent parent = getParent();
+            if (parent instanceof View) {
+                View parentView = (View) parent;
+                info.setParent(parentView);
+            }
         }
 
         info.setPackageName(mContext.getPackageName());

core/java/android/view/ViewGroup.java

@@ -2231,14 +2231,10 @@ boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) {
     @Override
     void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) {
         super.onInitializeAccessibilityNodeInfoInternal(info);
-        // If the view is not the topmost one in the view hierarchy and it is
-        // marked as the logical root of a view hierarchy, do not go any deeper.
-        if ((!(getParent() instanceof ViewRootImpl)) && (mPrivateFlags & IS_ROOT_NAMESPACE) != 0) {
-            return;
-        }
         for (int i = 0, count = mChildrenCount; i < count; i++) {
             View child = mChildren[i];
-            if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) {
+            if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE
+                    && (child.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) {
                 info.addChild(child);
             }
         }