Use SurfaceHandler in ReactSurface

Summary:
Changelog: [Internal]

Updates `ReactSurface` to use `SurfaceHandler` internally.
This removes most of the internal state in `ReactSurface` and propagates all the calls to the `SurfaceHandler`.

`FabricUIManager` now uses `SurfaceHandler` to start/stop the surface.
SurfaceId is still used for view operations. SurfaceId is also now mutable to play better with existing Android infra.

Reviewed By: shergin, mdvacca

Differential Revision: D26112992

fbshipit-source-id: 52e6860084d739381317035dc3011956d452063c

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

@@ -0,0 +1,47 @@
+/*
+ * 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.fabric;
+
+import com.facebook.react.bridge.NativeMap;
+import javax.annotation.concurrent.ThreadSafe;
+
+/** Represents a Java variant of the surface, its status and inner data required to display it. */
+@ThreadSafe
+public interface SurfaceHandler {
+
+  /** Starts the surface if the surface is not running */
+  void start();
+
+  /** Stops the surface if it is currently running */
+  void stop();
+
+  void setProps(NativeMap props);
+
+  /**
+   * Provides current surface id. Id should be updated after each call to {@link
+   * SurfaceHandler#stop}
+   */
+  int getSurfaceId();
+
+  /**
+   * Updates current surface id. Id should be updated after each call to {@link SurfaceHandler#stop}
+   */
+  void setSurfaceId(int surfaceId);
+
+  boolean isRunning();
+
+  String getModuleName();
+
+  void setLayoutConstraints(
+      int widthMeasureSpec,
+      int heightMeasureSpec,
+      int offsetX,
+      int offsetY,
+      boolean doLeftAndRightSwapInRTL,
+      boolean isRTL);
+}