Fix modals freezing on close with Nodes

Summary:
Modals were doing nothing (and sometimes crashing) when they were
being closed. The reason for this was due to the fact that the parent being
removed was not necessarily the view's parent. Consequently, trying to inform
said parent that its child was removed failed, because said parent wasn't a
view, and therefore had no record in mViewsToTags.

Reviewed By: sriramramani

Differential Revision: D3928850

ReactAndroid/src/main/java/com/facebook/react/flat/FlatUIViewOperationQueue.java

@@ -11,6 +11,8 @@ package com.facebook.react.flat;
 
 import javax.annotation.Nullable;
 
+import java.util.ArrayList;
+
 import android.util.SparseIntArray;
 import android.view.View;
 import android.view.ViewGroup;
@@ -207,8 +209,12 @@ import com.facebook.react.uimanager.UIViewOperationQueue;
 
     private final SparseIntArray mViewsToDrop;
 
-    private DropViews(SparseIntArray viewsToDrop) {
-      mViewsToDrop = viewsToDrop;
+    private DropViews(ArrayList<Integer> viewsToDrop, ArrayList<Integer> parentsForViewsToDrop) {
+      SparseIntArray sparseIntArray = new SparseIntArray();
+      for (int i = 0, count = viewsToDrop.size(); i < count; i++) {
+        sparseIntArray.put(viewsToDrop.get(i), parentsForViewsToDrop.get(i));
+      }
+      mViewsToDrop = sparseIntArray;
     }
 
     @Override
@@ -478,8 +484,10 @@ import com.facebook.react.uimanager.UIViewOperationQueue;
         new SetPadding(reactTag, paddingLeft, paddingTop, paddingRight, paddingBottom));
   }
 
-  public void enqueueDropViews(SparseIntArray viewsToDrop) {
-    enqueueUIOperation(new DropViews(viewsToDrop));
+  public void enqueueDropViews(
+      ArrayList<Integer> viewsToDrop,
+      ArrayList<Integer> parentsOfViewsToDrop) {
+    enqueueUIOperation(new DropViews(viewsToDrop, parentsOfViewsToDrop));
   }
 
   public void enqueueMeasureVirtualView(