Add sandbox support for associating peer processes

sandbox/src/broker_services.h

Index: sandbox/src/broker_services.h
===================================================================
--- sandbox/src/broker_services.h	(revision 131361)
+++ sandbox/src/broker_services.h	(working copy)
@@ -45,6 +45,8 @@
 
   virtual ResultCode WaitForAllTargets();
 
+  virtual ResultCode AddTargetPeer(HANDLE peer_process);
+
   // Checks if the supplied process ID matches one of the broker's active
   // target processes
   // Returns:
@@ -70,6 +72,9 @@
   // notifications and cleanup-related tasks.
   static DWORD WINAPI TargetEventsThread(PVOID param);
 
+  // Removes a target peer from the process list if it expires.
+  static VOID CALLBACK RemovePeer(PVOID process, BOOLEAN);
+
   // The completion port used by the job objects to communicate events to
   // the worker thread.
   HANDLE job_port_;