Nodes should support loading file:/// uris

Summary: Non-Nodes supports file:///, and Nodes should too.

Differential Revision: D3639675

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

@@ -46,6 +46,7 @@ import com.facebook.imagepipeline.request.ImageRequestBuilder;
     return
       source.startsWith("http://") ||
       source.startsWith("https://") ||
-      source.startsWith("data:");
+      source.startsWith("data:") ||
+      source.startsWith("file:///");
   }
 }