Added histogram on successful check. Safe verification

chrome/browser/protector/protector.cc

Index: chrome/browser/protector/protector.cc
diff --git a/chrome/browser/protector/protector.cc b/chrome/browser/protector/protector.cc
index e26fe18b8eea59a542401231c2675f1164139366..474374095d9df08ee5d6945b3d1f7449f500a5d4 100644
--- a/chrome/browser/protector/protector.cc
+++ b/chrome/browser/protector/protector.cc
@@ -77,4 +77,10 @@ std::string SignSetting(const std::string& value) {
   return std::string(&digest[0], &digest[0] + digest.size());
 }
 
+bool IsSettingValid(const std::string& value, const std::string& signature) {
+  crypto::HMAC hmac(crypto::HMAC::SHA256);
+  DCHECK(hmac.Init(kProtectorSigningKey));

[Ivan Korotkov, 2011/11/01 14:18:39]

Init should be called outside of DCHECK.

+  return hmac.Verify(value, signature);
+}
+
 }  // namespace protector