Support mojo connections between unrelated peer processes.

mojo/edk/system/core.h

 // 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.
 
 #ifndef MOJO_EDK_SYSTEM_CORE_H_
 #define MOJO_EDK_SYSTEM_CORE_H_
 
 #include <memory>
 #include <vector>
 
@@ skipping 44 matching lines @@
 
   // Called in the parent process any time a new child is launched.
   void AddChild(base::ProcessHandle process_handle,
                 ScopedPlatformHandle platform_handle,
                 const std::string& child_token,
                 const ProcessErrorCallback& process_error_callback);
 
   // Called in the parent process when a child process fails to launch.
   void ChildLaunchFailed(const std::string& child_token);
 
+  // Called to connect to a peer process. This should be called only if there
+  // is no common ancestor for the processes involved within this mojo system.
+  // Both processes must call this function, each passing one end of a platform
+  // channel. This returns one end of a message pipe to each process.
+  ScopedMessagePipeHandle ConnectToPeerProcess(
+      ScopedPlatformHandle pipe_handle);
+
   // Called in a child process exactly once during early initialization.
   void InitChild(ScopedPlatformHandle platform_handle);
 
   // Creates a message pipe endpoint connected to an endpoint in a remote
   // embedder. |platform_handle| is used as a channel to negotiate the
   // connection.
   ScopedMessagePipeHandle CreateMessagePipe(
       ScopedPlatformHandle platform_handle);
 
   // Creates a message pipe endpoint associated with |token|, which a child
@@ skipping 231 matching lines @@
   // Properties that can be read using the MojoGetProperty() API.
   bool property_sync_call_allowed_ = true;
 
   DISALLOW_COPY_AND_ASSIGN(Core);
 };
 
 }  // namespace edk
 }  // namespace mojo
 
 #endif  // MOJO_EDK_SYSTEM_CORE_H_