Don't use private access in FlipperRSocketResponder

Summary:
Changing FlipperRSocketResponder to only use public parts of FlipperConnectionManagerImpl.

This means we can test it by injecting a FCM mock, and it can use its public interface.

Reviewed By: passy

Differential Revision: D14000078

fbshipit-source-id: c0431a888b0ca041807631c81b99fb8b947274d6

xplat/Flipper/FlipperConnectionManagerImpl.cpp

@@ -193,7 +193,7 @@ void FlipperConnectionManagerImpl::connectSecurely() {
               std::move(address),
               std::move(sslContext)),
           std::move(parameters),
-          std::make_shared<FlipperRSocketResponder>(this),
+          std::make_shared<FlipperRSocketResponder>(this, connectionEventBase_),
           std::chrono::seconds(connectionKeepaliveSeconds), // keepaliveInterval
           nullptr, // stats
           std::make_shared<ConnectionEvents>(this))
@@ -241,6 +241,12 @@ void FlipperConnectionManagerImpl::sendMessage(const folly::dynamic& message) {
   });
 }
 
+void FlipperConnectionManagerImpl::onMessageReceived(
+    const folly::dynamic& message,
+    std::unique_ptr<FlipperResponder> responder) {
+  callbacks_->onMessageReceived(message, std::move(responder));
+}
+
 bool FlipperConnectionManagerImpl::isCertificateExchangeNeeded() {
   if (failedConnectionAttempts_ >= 2) {
     return true;