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

sync/sessions/sync_session_unittest.cc

 // 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.
 
 #include "sync/sessions/sync_session.h"
 
 #include "base/compiler_specific.h"
 #include "base/location.h"
 #include "base/memory/ref_counted.h"
 #include "base/message_loop.h"
@@ skipping 49 matching lines @@
 
     context_.reset(
         new SyncSessionContext(
             NULL,
             NULL,
             workers,
             &extensions_activity_monitor_,
             throttled_data_type_tracker_.get(),
             std::vector<SyncEngineEventListener*>(),
             NULL,
-            NULL));
+            NULL,
+            true  /* enable keystore encryption */));
     context_->set_routing_info(routes_);
 
     session_.reset(MakeSession());
     throttled_data_type_tracker_.reset(new ThrottledDataTypeTracker(NULL));
   }
   virtual void TearDown() {
     session_.reset();
     context_.reset();
   }
 
@@ skipping 414 matching lines @@
 
   ASSERT_EQ(3U, types_with_payloads.size());
   EXPECT_EQ(types_with_payloads[BOOKMARKS], payload);
   EXPECT_EQ(types_with_payloads[PASSWORDS], payload);
   EXPECT_EQ(types_with_payloads[AUTOFILL], payload);
 }
 
 }  // namespace
 }  // namespace sessions
 }  // namespace syncer