Changing SpawnChild to return a struct.

mojo/edk/embedder/pending_process_connection.h

Index: mojo/edk/embedder/pending_process_connection.h
diff --git a/mojo/edk/embedder/pending_process_connection.h b/mojo/edk/embedder/pending_process_connection.h
index 1f5cad9ff63e490541ada3a52af50d4e9723c491..2bd473f850b0269fccd44efba6ac45006407c079 100644
--- a/mojo/edk/embedder/pending_process_connection.h
+++ b/mojo/edk/embedder/pending_process_connection.h
@@ -10,6 +10,7 @@
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/process/process_handle.h"
+#include "mojo/edk/embedder/connection_param.h"
 #include "mojo/edk/embedder/scoped_platform_handle.h"
 #include "mojo/edk/system/system_impl_export.h"
 #include "mojo/public/cpp/system/message_pipe.h"
@@ -88,8 +89,8 @@ class MOJO_SYSTEM_IMPL_EXPORT PendingProcessConnection {
   // Connects to the process. This must be called at most once, with the process
   // handle in |process|.
   //
-  // |channel| is the platform handle of an OS pipe which can be used to
-  // communicate with the connected process. The other end of that pipe must
+  // |connection_param| is the platform handle of an OS pipe which can be used
+  // to communicate with the connected process. The other end of that pipe must
   // ultimately be passed to mojo::edk::SetParentPipeHandle in the remote
   // process, and getting that end of the pipe into the other process is the
   // embedder's responsibility.
@@ -101,7 +102,7 @@ class MOJO_SYSTEM_IMPL_EXPORT PendingProcessConnection {
   // created by CreateMessagePipe above) will be cleaned up at that time.
   void Connect(
       base::ProcessHandle process,
-      ScopedPlatformHandle channel,
+      ConnectionParam connection_param,
       const ProcessErrorCallback& error_callback = ProcessErrorCallback());
 
  private: