Switch to using ViewManagerResolver for view managers

Summary:
Right now the FbReactInstanceDelegate provides a list of view managers to the instance during initialization, this means that we're basically eagerly loading all of the view manager classes.

In this change we use ViewManagerResolver instead.

Changelog:
[Android][Changed] - Move ViewManagerResolver into a seperate file

Reviewed By: mdvacca

Differential Revision: D26424214

fbshipit-source-id: 550ade31c256a56d6e32c463f112ea16dd55a218

ReactAndroid/src/main/java/com/facebook/react/uimanager/ViewManagerResolver.java

@@ -0,0 +1,26 @@
+/*
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+package com.facebook.react.uimanager;
+
+import java.util.List;
+import javax.annotation.Nullable;
+
+/** Enables lazy discovery of a specific {@link ViewManager} by its name. */
+public interface ViewManagerResolver {
+  /**
+   * {@class UIManagerModule} class uses this method to get a ViewManager by its name. This is the
+   * same name that comes from JS by {@code UIManager.ViewManagerName} call.
+   */
+  @Nullable
+  ViewManager getViewManager(String viewManagerName);
+
+  /**
+   * Provides a list of view manager names to register in JS as {@code UIManager.ViewManagerName}
+   */
+  List<String> getViewManagerNames();
+}