Support mojo connections between unrelated peer processes.

mojo/edk/system/core.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "mojo/edk/system/core.h"
 
 #include <string.h>
 
 #include <utility>
 
@@ skipping 169 matching lines @@
                                       std::move(platform_handle),
                                       child_token,
                                       process_error_callback);
 }
 
 void Core::ChildLaunchFailed(const std::string& child_token) {
   RequestContext request_context;
   GetNodeController()->CloseChildPorts(child_token);
 }
 
+ScopedMessagePipeHandle Core::ConnectToPeerProcess(
+    ScopedPlatformHandle pipe_handle) {
+  RequestContext request_context;
+  ports::PortRef port0, port1;
+  GetNodeController()->node()->CreatePortPair(&port0, &port1);
+  MojoHandle handle = AddDispatcher(new MessagePipeDispatcher(
+      GetNodeController(), port0, kUnknownPipeIdForDebug, 0));
+  GetNodeController()->ConnectToPeer(std::move(pipe_handle), port1);
+  return ScopedMessagePipeHandle(MessagePipeHandle(handle));
+}
+
 void Core::InitChild(ScopedPlatformHandle platform_handle) {
   GetNodeController()->ConnectToParent(std::move(platform_handle));
 }
 
 void Core::SetMachPortProvider(base::PortProvider* port_provider) {
 #if defined(OS_MACOSX) && !defined(OS_IOS)
   GetNodeController()->CreateMachPortRelay(port_provider);
 #endif
 }
 
@@ skipping 979 matching lines @@
     std::unique_ptr<NodeController> node_controller) {
   // It's OK to leak this reference. At this point we know the IO loop is still
   // running, and we know the NodeController will observe its eventual
   // destruction. This tells the NodeController to delete itself when that
   // happens.
   node_controller.release()->DestroyOnIOThreadShutdown();
 }
 
 }  // namespace edk
 }  // namespace mojo