Partially remove dependency on folly async

Summary:
This change isolates the usage of folly async from Flipper. Is now self-contained in Flipper Folly schedulers.

Users of Flipper can decide not to use the types defined in that header and implement their own.

NOTE: changes are minimal, we are just replacing direct calls to folly event base with a scheduler which simply relays this on to folly.

Reviewed By: fabiomassimo

Differential Revision: D36052198

fbshipit-source-id: 170d64a324a1f1f100224e2622a59cbac3c8b642

xplat/FlipperWebSocket/FlipperWebSocket.cpp

@@ -14,8 +14,6 @@
 #include <Flipper/Log.h>
 #include <folly/String.h>
 #include <folly/futures/Future.h>
-#include <folly/io/async/AsyncSocketException.h>
-#include <folly/io/async/SSLContext.h>
 #include <folly/json.h>
 #include <cctype>
 #include <iomanip>
@@ -32,24 +30,24 @@ namespace flipper {
 FlipperWebSocket::FlipperWebSocket(
     FlipperConnectionEndpoint endpoint,
     std::unique_ptr<FlipperSocketBasePayload> payload,
-    folly::EventBase* eventBase)
+    Scheduler* scheduler)
     : FlipperWebSocket(
           std::move(endpoint),
           std::move(payload),
-          eventBase,
+          scheduler,
           nullptr) {}
 
 FlipperWebSocket::FlipperWebSocket(
     FlipperConnectionEndpoint endpoint,
     std::unique_ptr<FlipperSocketBasePayload> payload,
-    folly::EventBase* eventBase,
+    Scheduler* scheduler,
     ConnectionContextStore* connectionContextStore) {
   if (endpoint.secure) {
     socket_ = std::make_unique<WebSocketTLSClient>(
-        endpoint, std::move(payload), eventBase, connectionContextStore);
+        endpoint, std::move(payload), scheduler, connectionContextStore);
   } else {
     socket_ = std::make_unique<WebSocketClient>(
-        endpoint, std::move(payload), eventBase, connectionContextStore);
+        endpoint, std::move(payload), scheduler, connectionContextStore);
   }
 }