A version with the RN ancestor stuff (APSL#57)

Changed code to match the latest version of the RN pull request

Author: alvaromb

lib/KeyboardAwareMixin.js

@@ -1,7 +1,7 @@
 /* @flow */
 
 import { PropTypes } from 'react'
-import ReactNative, { TextInput, Keyboard } from 'react-native'
+import ReactNative, { TextInput, Keyboard, UIManager } from 'react-native'
 import TimerMixin from 'react-timer-mixin'
 
 const _KAM_DEFAULT_TAB_BAR_HEIGHT = 49
@@ -52,11 +52,15 @@ const KeyboardAwareMixin = {
       if (!currentlyFocusedField) {
         return
       }
-      try {
-        this.scrollToFocusedInputWithNodeHandle(currentlyFocusedField)
-      } catch (e) {
-
-      }
+      UIManager.viewIsDescendantOf(
+        currentlyFocusedField,
+        this.getScrollResponder().getInnerViewNode(),
+        (isAncestor) => {
+          if (isAncestor) {
+            this.scrollToFocusedInputWithNodeHandle(currentlyFocusedField)
+          }
+        }
+      )
     }
   },