Add GuardedRunnable to run blocks of code on the UI thread with automatic redboxing

Summary: Like GuardedAsyncTask, et al, but for Runnables.

Reviewed By: achen1

Differential Revision: D4537287

fbshipit-source-id: 8ae60c7007843c0b7d8e5c3835d0847921fb3db5

ReactAndroid/src/main/java/com/facebook/react/bridge/GuardedRunnable.java

@@ -0,0 +1,28 @@
+// Copyright 2004-present Facebook. All Rights Reserved.
+
+package com.facebook.react.bridge;
+
+/**
+ * Abstract base for a Runnable that should have any RuntimeExceptions it throws
+ * handled by the {@link com.facebook.react.bridge.NativeModuleCallExceptionHandler} registered if
+ * the app is in dev mode.
+ */
+public abstract class GuardedRunnable implements Runnable {
+
+  private final ReactContext mReactContext;
+
+  public GuardedRunnable(ReactContext reactContext) {
+    mReactContext = reactContext;
+  }
+
+  @Override
+  public final void run() {
+    try {
+      runGuarded();
+    } catch (RuntimeException e) {
+      mReactContext.handleException(e);
+    }
+  }
+
+  public abstract void runGuarded();
+}