Add mojo::edk::ClosePeerConnection.

mojo/edk/test/multiprocess_test_helper.cc

Index: mojo/edk/test/multiprocess_test_helper.cc
diff --git a/mojo/edk/test/multiprocess_test_helper.cc b/mojo/edk/test/multiprocess_test_helper.cc
index 611c465bd387c0865e27714cdce1ed23ef4a8782..68336bd8a60de229d5f6cbf074f5f9ffbb3b1945 100644
--- a/mojo/edk/test/multiprocess_test_helper.cc
+++ b/mojo/edk/test/multiprocess_test_helper.cc
@@ -146,9 +146,11 @@ ScopedMessagePipeHandle MultiprocessTestHelper::StartChildWithExtraSwitch(
       launch_type == LaunchType::NAMED_CHILD) {
     pipe = CreateParentMessagePipe(pipe_token, child_token);
   } else if (launch_type == LaunchType::PEER) {
-    pipe = ConnectToPeerProcess(channel.PassServerHandle());
+    peer_token_ = mojo::edk::GenerateRandomToken();
+    pipe = ConnectToPeerProcess(channel.PassServerHandle(), peer_token_);
   } else if (launch_type == LaunchType::NAMED_PEER) {
-    pipe = ConnectToPeerProcess(CreateServerHandle(named_pipe));
+    peer_token_ = mojo::edk::GenerateRandomToken();
+    pipe = ConnectToPeerProcess(CreateServerHandle(named_pipe), peer_token_);
   }
 
   test_child_ =
@@ -184,6 +186,12 @@ int MultiprocessTestHelper::WaitForChildShutdown() {
   return rv;
 }
 
+void MultiprocessTestHelper::ClosePeerConnection() {
+  DCHECK(!peer_token_.empty());
+  ::mojo::edk::ClosePeerConnection(peer_token_);
+  peer_token_.clear();
+}
+
 bool MultiprocessTestHelper::WaitForChildTestShutdown() {
   return WaitForChildShutdown() == 0;
 }