Handle-passing: Allow a handle-passing function to be supplied by Chromium

src/trusted/service_runtime/sel_main_chrome.c

Index: src/trusted/service_runtime/sel_main_chrome.c
diff --git a/src/trusted/service_runtime/sel_main_chrome.c b/src/trusted/service_runtime/sel_main_chrome.c
index 7543bffcd13b741d696c9c418c6110b1c0993832..1c1b06d00c0a2a66b1ecad0658bf845f8e5319c2 100644
--- a/src/trusted/service_runtime/sel_main_chrome.c
+++ b/src/trusted/service_runtime/sel_main_chrome.c
@@ -45,6 +45,9 @@ struct NaClChromeMainArgs *NaClChromeMainArgsCreate(void) {
   args->enable_debug_stub = 0;
   args->create_memory_object_func = NULL;
   args->validation_cache = NULL;
+#if NACL_WINDOWS
+  args->broker_duplicate_handle_func = NULL;
+#endif
   return args;
 }
 
@@ -121,6 +124,11 @@ void NaClChromeMainStart(struct NaClChromeMainArgs *args) {
   /* Inject the validation caching interface, if it exists. */
   nap->validation_cache = args->validation_cache;
 
+#if NACL_WINDOWS
+  if (args->broker_duplicate_handle_func != NULL)
+    NaClSetBrokerDuplicateHandleFunc(args->broker_duplicate_handle_func);
+#endif
+
   NaClAppInitialDescriptorHookup(nap);
 
   /*