[DirectSockets] Add TCPServerSocket support on the browser side

This CL adds OpenTCPServerSocket() to direct_sockets.mojom to forward
opening calls from the renderer to the network service.

Bug: 1408140
Change-Id: Ifeb353964520877db1862e99e3a66c78356a1313
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4231841
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Commit-Queue: Andrew Rayskiy <greengrape@google.com>
Reviewed-by: Arthur Sonzogni <arthursonzogni@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1107667}
diff --git a/resources/chromium/mock-direct-sockets.js b/resources/chromium/mock-direct-sockets.js
index 0752850..e2e0245 100644
--- a/resources/chromium/mock-direct-sockets.js
+++ b/resources/chromium/mock-direct-sockets.js
@@ -38,6 +38,15 @@
         result: -11
       });
     }
+
+    openTCPServerSocket(
+      options,
+      receiver) {
+      return Promise.resolve({
+        // return result = net:Error::NOT_IMPLEMENTED (code -11)
+        result: -11
+      });
+    }
   }
 
   let testInternal = {