Add validation caching interface.

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 198fe8893974e76be60dbe5ff5439cbcfc956ddb..217460fe84ad85455b8b19089a68ebf1735ea98c 100644
--- a/src/trusted/service_runtime/sel_main_chrome.c
+++ b/src/trusted/service_runtime/sel_main_chrome.c
@@ -29,6 +29,7 @@
 #include "native_client/src/trusted/service_runtime/sel_ldr.h"
 #include "native_client/src/trusted/service_runtime/sel_qualify.h"
 #include "native_client/src/trusted/service_runtime/win/exception_patch/ntdll_patch.h"
+#include "native_client/src/trusted/validator/validation_cache.h"
 
 int verbosity = 0;
 
@@ -73,6 +74,15 @@ static void NaClLoadIrt(struct NaClApp *nap) {
   (*NACL_VTBL(Gio, gio_desc)->Dtor)(gio_desc);
 }
 
+static NaClValidationCache *g_validation_cache = NULL;
+static void *g_validation_cache_context = NULL;
+
+/* TODO(ncbray) consolidate Chrome's sel_ldr setup to a single function. */
+void NaClSetValidationCache(NaClValidationCache *cache, void *cache_context) {
+  g_validation_cache = cache;
+  g_validation_cache_context = cache_context;
+}
+
 void NaClMainForChromium(int handle_count, const NaClHandle *handles,
                          int debug) {
   char *av[1];
@@ -108,6 +118,10 @@ void NaClMainForChromium(int handle_count, const NaClHandle *handles,
 
   errcode = LOAD_OK;
 
+  /* Inject the validation caching interface, if it exists. */
+  nap->validation_cache = g_validation_cache;
+  nap->validation_cache_context = g_validation_cache_context;
+
   NaClAppInitialDescriptorHookup(nap);
 
   /*