Pass concurrentRoot flag through to renderApplication

Summary:
Changelog: [internal]

Pass concurrentRoot flag to renderApplication.

Reviewed By: rubennorte

Differential Revision: D28630516

fbshipit-source-id: 959b9c684a8736a28a86d42699a78c96da859224

Libraries/ReactNative/AppContainer.js

@@ -19,6 +19,7 @@ import * as React from 'react';
 type Props = $ReadOnly<{|
   children?: React.Node,
   fabric?: boolean,
+  useConcurrentRoot?: boolean,
   rootTag: number | RootTag,
   initialProps?: {...},
   showArchitectureIndicator?: boolean,

Libraries/ReactNative/AppRegistry.js

@@ -128,6 +128,7 @@ const AppRegistry = {
           appKey === 'LogBox',
           appKey,
           coerceDisplayMode(displayMode),
+          appParameters.concurrentRoot,
         );
       },
     };

Libraries/ReactNative/renderApplication.js

@@ -32,6 +32,7 @@ function renderApplication<Props: Object>(
   isLogBox?: boolean,
   debugName?: string,
   displayMode?: ?DisplayModeType,
+  useConcurrentRoot?: boolean,
 ) {
   invariant(rootTag, 'Expect to have a valid rootTag, instead got ', rootTag);
 
@@ -64,9 +65,13 @@ function renderApplication<Props: Object>(
 
   performanceLogger.startTimespan('renderApplication_React_render');
   performanceLogger.setExtra('usedReactFabric', fabric ? '1' : '0');
-
   if (fabric) {
-    require('../Renderer/shims/ReactFabric').render(renderable, rootTag);
+    require('../Renderer/shims/ReactFabric').render(
+      renderable,
+      rootTag,
+      null,
+      useConcurrentRoot,
+    );
   } else {
     require('../Renderer/shims/ReactNative').render(renderable, rootTag);
   }