Add export to query for blacklisted-ness.

chrome_elf/blacklist/blacklist.cc

Index: chrome_elf/blacklist/blacklist.cc
diff --git a/chrome_elf/blacklist/blacklist.cc b/chrome_elf/blacklist/blacklist.cc
index 7244665ce6ff5d3a62fe4fa0f1deaccf62fbcb66..809bfaaae61633d9131deca94402402eeadd1bd0 100644
--- a/chrome_elf/blacklist/blacklist.cc
+++ b/chrome_elf/blacklist/blacklist.cc
@@ -225,6 +225,14 @@ bool IsBlacklistInitialized() {
   return g_blacklist_initialized;
 }
 
+int GetBlacklistIndex(const wchar_t* dll_name) {
+  for (int i = 0; i < kTroublesomeDllsMaxCount, g_troublesome_dlls[i]; ++i) {
+    if (_wcsicmp(dll_name, g_troublesome_dlls[i]) == 0)
+      return i;
+  }
+  return -1;
+}
+
 bool AddDllToBlacklist(const wchar_t* dll_name) {
   int blacklist_size = BlacklistSize();
   // We need to leave one space at the end for the null pointer.