Open source Fabric android

Summary: This diff open sources Fabric Android implementation and it extracts ComponentDescriptorFactory into a function that can be "injected" per application

Reviewed By: shergin

Differential Revision: D13616172

fbshipit-source-id: 7b7a6461216740b5a1ad5ebbead9e37de4570221

ReactAndroid/src/main/java/com/facebook/react/fabric/GuardedFrameCallback.java

@@ -0,0 +1,34 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * <p>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.fabric;
+
+import com.facebook.react.bridge.ReactContext;
+import com.facebook.react.modules.core.ChoreographerCompat;
+
+public abstract class GuardedFrameCallback extends ChoreographerCompat.FrameCallback {
+
+  private final ReactContext mReactContext;
+
+  protected GuardedFrameCallback(ReactContext reactContext) {
+    mReactContext = reactContext;
+  }
+
+  @Override
+  public final void doFrame(long frameTimeNanos) {
+    try {
+      doFrameGuarded(frameTimeNanos);
+    } catch (RuntimeException e) {
+      mReactContext.handleException(e);
+    }
+  }
+
+  /**
+   * Like the standard doFrame but RuntimeExceptions will be caught and passed to {@link
+   * com.facebook.react.bridge.ReactContext#handleException(RuntimeException)}.
+   */
+  protected abstract void doFrameGuarded(long frameTimeNanos);
+}