Fix buggy behavior of setBackgroundColor in react View.

Differential Revision: D2582549

fb-gh-sync-id: 8856eb27d46df37e201cd1169fcec3b5b68dac97

ReactAndroid/src/main/java/com/facebook/react/views/view/ReactViewGroup.java

@@ -118,18 +118,8 @@ public class ReactViewGroup extends ViewGroup implements
 
   @Override
   public void setBackgroundColor(int color) {
-    if (color == Color.TRANSPARENT) {
-      Drawable backgroundDrawble = getBackground();
-      if (mReactBackgroundDrawable != null && (backgroundDrawble instanceof LayerDrawable)) {
-        // extract translucent background portion from layerdrawable
-        super.setBackground(null);
-        LayerDrawable layerDrawable = (LayerDrawable) backgroundDrawble;
-        super.setBackground(layerDrawable.getDrawable(1));
-      } else if (backgroundDrawble instanceof ReactViewBackgroundDrawable) {
-        // mReactBackground is set for background
-        mReactBackgroundDrawable = null;
-        super.setBackground(null);
-      }
+    if (color == Color.TRANSPARENT && mReactBackgroundDrawable == null) {
+      // don't do anything, no need to allocate ReactBackgroundDrawable for transparent background
     } else {
       getOrCreateReactViewBackground().setColor(color);
     }