fix(webkit): band-aid double connection fix to unblock tests (#422)

src/server/wkPlaywright.ts

@@ -67,7 +67,7 @@ export class WKBrowserServer {
 
   async close(): Promise<void> {
     const transport = await createTransport(this._connectOptions);
-    const connection = new WKConnection(transport);
+    const connection = WKConnection.from(transport);
     await connection.send('Browser.close');
     connection.dispose();
   }

src/webkit/wkBrowser.ts

@@ -51,7 +51,7 @@ export class WKBrowser extends browser.Browser {
 
   constructor(transport: ConnectionTransport) {
     super();
-    this._connection = new WKConnection(transport);
+    this._connection = WKConnection.from(transport);
 
     this._defaultContext = this._createBrowserContext(undefined, {});
 

src/webkit/wkConnection.ts

@@ -34,6 +34,8 @@ export const WKPageProxySessionEvents = {
   DidCommitProvisionalTarget: Symbol('PageProxyEvents.DidCommitProvisionalTarget'),
 };
 
+const kConnectionSymbol = Symbol();
+
 export class WKConnection extends platform.EventEmitter {
   private _lastId = 0;
   private readonly _callbacks = new Map<number, {resolve:(o: any) => void, reject:  (e: Error) => void, error: Error, method: string}>();
@@ -42,6 +44,15 @@ export class WKConnection extends platform.EventEmitter {
 
   private _closed = false;
 
+  static from(transport: ConnectionTransport): WKConnection {
+    let connection = (transport as any)[kConnectionSymbol];
+    if (!connection) {
+      connection = new WKConnection(transport);
+      (transport as any)[kConnectionSymbol] = connection;
+    }
+    return connection;
+  }
+
   constructor(transport: ConnectionTransport) {
     super();
     this._transport = transport;