Transfer 'DisplayMode' value from Native -> JS

Summary:
This diff adds a new variable called "DisplayMode" into SurfaceHandler.cpp and FacebookAppRouteHandler.js. The purpose of DisplayMode is for the native pre-render system to notify React that the a surface is either being "pre-rendered" or "rendered"

When the surface is being "pre-rendered" (displayMode == "SUSPENDED"), react will create and commit React Trees, but it will not execute use-effect callbacks

When the surface is being "rendered" (displayMode == "VISIBLE"), react will create and commit React Trees and it will not execute all use-effect callbacks that weren't executed during "pre-rendering"

By default surfaces are going to be rendered with displayMode == "VISIBLE".

This diff should not create any change of behavior for now, this is the infra required to integrate the new offScreen API the react team is working on for pre-rendering system

changelog: [internal] internal

Reviewed By: yungsters

Differential Revision: D27614664

fbshipit-source-id: f1f42fdf174c2ffa74174feb1873f1d5d46e7a95

ReactCommon/react/renderer/uimanager/primitives.h

@@ -125,6 +125,8 @@ inline static SurfaceId surfaceIdFromValue(
 }
 
 inline static int displayModeToInt(DisplayMode const value) {
+  // the result of this method should be in sync with
+  // Libraries/ReactNative/DisplayMode.js
   switch (value) {
     case DisplayMode::Visible:
       return 1;