IPC::ChannelMojo: Introduce IPC::MojoBootstrap for Windows

ipc/ipc_channel.h

Index: ipc/ipc_channel.h
diff --git a/ipc/ipc_channel.h b/ipc/ipc_channel.h
index d27af5807387ed53fa685cea75053bd4a4d8c5c2..a10582eb03abaa3799c0936927834bea31914209 100644
--- a/ipc/ipc_channel.h
+++ b/ipc/ipc_channel.h
@@ -13,6 +13,7 @@
 
 #include "base/compiler_specific.h"
 #include "base/process/process.h"
+#include "base/process/process_handle.h"
 #include "ipc/ipc_channel_handle.h"
 #include "ipc/ipc_message.h"
 #include "ipc/ipc_sender.h"
@@ -178,6 +179,11 @@ class IPC_EXPORT Channel : public Sender {
   // so the channel isn't valid after the call.
   virtual ChannelHandle TakePipeHandle() WARN_UNUSED_RESULT = 0;
 
+  // Tell a server channel its client process handle.  A Channel
+  // implementation may need this to establish the connection to the
+  // client. This should only be called on server-side channel.
+  virtual void OnClientLaunched(base::ProcessHandle handle);
+
   // Send a message over the Channel to the listener on the other end.
   //
   // |message| must be allocated using operator new.  This object will be