Introduce ChannelMojo

ipc/ipc_channel_posix.cc

Index: ipc/ipc_channel_posix.cc
diff --git a/ipc/ipc_channel_posix.cc b/ipc/ipc_channel_posix.cc
index 8ddf73a2442349eb2f2576b9922e7a4b91616ea1..ac9de554657771704fe9d7a58bbad53c5587522d 100644
--- a/ipc/ipc_channel_posix.cc
+++ b/ipc/ipc_channel_posix.cc
@@ -747,7 +747,7 @@ void ChannelPosix::ClosePipeOnError() {
   }
 }
 
-int ChannelPosix::GetHelloMessageProcId() {
+int ChannelPosix::GetHelloMessageProcId() const {
   int pid = base::GetCurrentProcId();
 #if defined(OS_LINUX)
   // Our process may be in a sandbox with a separate PID namespace.
@@ -1050,6 +1050,17 @@ base::ProcessId ChannelPosix::GetPeerPID() const {
   return peer_pid_;
 }
 
+base::ProcessId ChannelPosix::GetSelfPID() const {
+  return GetHelloMessageProcId();
+}
+
+ChannelHandle ChannelPosix::TakePipeHandle() {
+  ChannelHandle handle = ChannelHandle(pipe_name_,
+                                       base::FileDescriptor(pipe_, false));
+  pipe_ = -1;
+  return handle;
+}
+
 //------------------------------------------------------------------------------
 // Channel's methods