chromeos: Avoid EasyUnlockGetKeysOperation D-Bus log spam.

chrome/browser/chromeos/login/easy_unlock/easy_unlock_get_keys_operation.h

Index: chrome/browser/chromeos/login/easy_unlock/easy_unlock_get_keys_operation.h
diff --git a/chrome/browser/chromeos/login/easy_unlock/easy_unlock_get_keys_operation.h b/chrome/browser/chromeos/login/easy_unlock/easy_unlock_get_keys_operation.h
index 813ed251d393b3f80b3e7880a37e74c7078d626b..00f25f0323a9f9f87e688f94d3cd2b07b2e33d95 100644
--- a/chrome/browser/chromeos/login/easy_unlock/easy_unlock_get_keys_operation.h
+++ b/chrome/browser/chromeos/login/easy_unlock/easy_unlock_get_keys_operation.h
@@ -26,10 +26,19 @@ class EasyUnlockGetKeysOperation {
                              const GetKeysCallback& callback);
   ~EasyUnlockGetKeysOperation();
 
+  // Starts the operation. If the cryptohome service is not yet available, the
+  // request will be deferred until it is ready.
   void Start();
 
  private:
+  // Called once when the cryptohome service is available.
+  void OnCryptohomeAvailable(bool available);
+
+  // Asynchronously requests data for |key_index_| from cryptohome.
   void GetKeyData();
+
+  // Callback for GetKeyData(). Updates |devices_|, increments |key_index_|, and
+  // calls GetKeyData() again.
   void OnGetKeyData(
       bool success,
       cryptohome::MountError return_code,