Adding method to create process using LowBox token in sandbox code.

sandbox/win/src/app_container.cc

Index: sandbox/win/src/app_container.cc
diff --git a/sandbox/win/src/app_container.cc b/sandbox/win/src/app_container.cc
index f8d754191592341cd2e37390c5f91cc8501713a8..af16dca363ddd931b60b4fec91ec077489bd5a16 100644
--- a/sandbox/win/src/app_container.cc
+++ b/sandbox/win/src/app_container.cc
@@ -94,6 +94,10 @@ bool AppContainerAttributes::HasAppContainer() const {
   return (capabilities_.AppContainerSid != NULL);
 }
 
+const SECURITY_CAPABILITIES& AppContainerAttributes::GetCapabilities() const {
+  return capabilities_;
+}
+
 ResultCode CreateAppContainer(const base::string16& sid,
                               const base::string16& name) {
   PSID local_sid;