Added logging in PolicyBase::AddRule.

sandbox/win/src/sandbox_policy_base.cc

Index: sandbox/win/src/sandbox_policy_base.cc
diff --git a/sandbox/win/src/sandbox_policy_base.cc b/sandbox/win/src/sandbox_policy_base.cc
index 7b9262b079a58923cba919860ca5e54f0e43c3b1..8b754323e24ed408ea328b55de5f8af476a66951 100644
--- a/sandbox/win/src/sandbox_policy_base.cc
+++ b/sandbox/win/src/sandbox_policy_base.cc
@@ -373,8 +373,21 @@ ResultCode PolicyBase::SetStderrHandle(HANDLE handle) {
   return SBOX_ALL_OK;
 }
 
-ResultCode PolicyBase::AddRule(SubSystem subsystem, Semantics semantics,
+ResultCode PolicyBase::AddRule(SubSystem subsystem,
+                               Semantics semantics,
                                const wchar_t* pattern) {
+  ResultCode result = AddRuleInternal(subsystem, semantics, pattern);
+  LOG_IF(ERROR, result != SBOX_ALL_OK) << "Failed to add sandbox rule."
+                                       << " error = " << result
+                                       << ", subsystem = " << subsystem
+                                       << ", semantics = " << semantics
+                                       << ", pattern = '" << pattern << "'";
+  return result;
+}
+
+ResultCode PolicyBase::AddRuleInternal(SubSystem subsystem,
+                                       Semantics semantics,
+                                       const wchar_t* pattern) {
   if (NULL == policy_) {
     policy_ = MakeBrokerPolicyMemory();
     DCHECK(policy_);