Native Client side changes for debugging support: stdout/err -> postmessage.

src/trusted/reverse_service/reverse_service.h

Index: src/trusted/reverse_service/reverse_service.h
===================================================================
--- src/trusted/reverse_service/reverse_service.h	(revision 7373)
+++ src/trusted/reverse_service/reverse_service.h	(working copy)
@@ -29,7 +29,7 @@
  public:
   virtual ~ReverseInterface() {}
 
-  // debugging, messaging
+  // For debugging, messaging.  |message| goes to JavaScript console.
   virtual void Log(nacl::string message) = 0;
 
   // Startup handshake
@@ -60,6 +60,14 @@
   // any interested parties.
   virtual void ReportExitStatus(int exit_status) = 0;
 
+  // Standard output and standard error redirection, via setting
+  // NACL_EXE_STDOUT to the string "DEBUG_ONLY:dev://postmessage" (see
+  // native_client/src/trusted/nacl_resource.* and sel_ldr).  NB: the
+  // contents of |message| is arbitrary bytes and not an Unicode
+  // string, so the implementation should take care to handle this
+  // appropriately.
+  virtual void PostMessage(nacl::string message);  // eventually = 0;
+
   // covariant impl of Ref()
   ReverseInterface* Ref() {  // down_cast
     return reinterpret_cast<ReverseInterface*>(RefCountBase::Ref());