[Sync] Add support for performing a GetKey on startup.

sync/test/engine/mock_connection_manager.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // Mock ServerConnectionManager class for use in client unit tests.
 
 #ifndef SYNC_TEST_ENGINE_MOCK_CONNECTION_MANAGER_H_
 #define SYNC_TEST_ENGINE_MOCK_CONNECTION_MANAGER_H_
 
 #include <bitset>
@@ skipping 104 matching lines @@
   void SetChangesRemaining(int64 count);
 
   // Add a new batch of updates after the current one.  Allows multiple
   // GetUpdates responses to be buffered up, since the syncer may
   // issue multiple requests during a sync cycle.
   void NextUpdateBatch();
 
   void FailNextPostBufferToPathCall() { countdown_to_postbuffer_fail_ = 1; }
   void FailNthPostBufferToPathCall(int n) { countdown_to_postbuffer_fail_ = n; }
 
+  void SetKeystoreKey(const std::string& key);
+
   void FailNonPeriodicGetUpdates() { fail_non_periodic_get_updates_ = true; }
 
   // Simple inspectors.
   bool client_stuck() const { return client_stuck_; }
 
   sync_pb::ClientCommand* GetNextClientCommand();
 
   const std::vector<syncable::Id>& committed_ids() const {
     return committed_ids_;
   }
@@ skipping 162 matching lines @@
   // Our directory.  Used only to ensure that we are not holding the transaction
   // lock when performing network I/O.  Can be NULL if the test author is
   // confident this can't happen.
   syncable::Directory* directory_;
 
   // The updates we'll return to the next request.
   std::list<sync_pb::GetUpdatesResponse> update_queue_;
   base::Closure mid_commit_callback_;
   MidCommitObserver* mid_commit_observer_;
 
-  // The clear data response we'll return in the next response
-  sync_pb::SyncEnums::ErrorType clear_user_data_response_errortype_;
+  // The keystore key we return for a GetUpdates with need_encryption_key set.
+  std::string keystore_key_;
 
   // The AUTHENTICATE response we'll return for auth requests.
   sync_pb::AuthenticateResponse auth_response_;
   // What we use to determine if we should return SUCCESS or BAD_AUTH_TOKEN.
   std::string valid_auth_token_;
 
   // Whether we are faking a server mandating clients to throttle requests.
   // Protected by |response_code_override_lock_|.
   bool throttling_;
 
@@ skipping 26 matching lines @@
   std::string next_token_;
 
   sync_pb::ClientToServerMessage last_request_;
 
   DISALLOW_COPY_AND_ASSIGN(MockConnectionManager);
 };
 
 }  // namespace syncer
 
 #endif  // SYNC_TEST_ENGINE_MOCK_CONNECTION_MANAGER_H_