Enable focus navigation messages for the web build

Author: tnajdek

src/index.web.js

@@ -109,6 +109,12 @@ class EditorInstance {
 				viewMode="web"
 				showUpdateNotice={this._editorCore.unsupportedSchema}
 				editorCore={this._editorCore}
+				onFocusBack={() => {
+					this._postMessage({ action: 'focusBack' });
+				}}
+				onFocusForward={() => {
+					this._postMessage({ action: 'focusForward' });
+				}}
 				onClickReturn={() => {
 				}}
 				onShowNote={() => {