Resubmit: [react_native] WebWorkers: Add JSLoader API for loading script from assets with AssetLoader reference

Summary:
public

Adds the ability to load files from assets without threading through an AssetManager. After the bridge is unforked, we should move to passing through an Environment object instead.

Resubmit: previous version was reverted due to adsmanager crash

Reviewed By: foghina

Differential Revision: D2802899

fb-gh-sync-id: 3d850256fc22f7e9eb21fa71f6adb09cacc839c4

ReactAndroid/src/main/java/com/facebook/react/common/ApplicationHolder.java

@@ -0,0 +1,37 @@
+/**
+ * Copyright (c) 2015-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ */
+
+package com.facebook.react.common;
+
+import android.app.Application;
+
+import com.facebook.infer.annotation.Assertions;
+import com.facebook.proguard.annotations.DoNotStrip;
+
+/**
+ * Holds the current Application Object.
+ *
+ * TODO(9577825): This is a bad pattern, we should thread through an Environment object instead.
+ * Remove once bridge is unforked.
+ */
+@DoNotStrip
+@Deprecated
+public class ApplicationHolder {
+
+  private static Application sApplication;
+
+  public static void setApplication(Application application) {
+    sApplication = application;
+  }
+
+  @DoNotStrip
+  public static Application getApplication() {
+    return Assertions.assertNotNull(sApplication);
+  }
+}