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

sync/sessions/sync_session_context.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.
 
 // SyncSessionContext encapsulates the contextual information and engine
 // components specific to a SyncSession. A context is accessible via
 // a SyncSession so that session SyncerCommands and parts of the engine have
 // a convenient way to access other parts. In this way it can be thought of as
 // the surrounding environment for the SyncSession. The components of this
 // environment are either valid or not valid for the entire context lifetime,
@@ skipping 38 matching lines @@
 
 class SyncSessionContext {
  public:
   SyncSessionContext(ServerConnectionManager* connection_manager,
                      syncable::Directory* directory,
                      const std::vector<ModelSafeWorker*>& workers,
                      ExtensionsActivityMonitor* extensions_activity_monitor,
                      ThrottledDataTypeTracker* throttled_data_type_tracker,
                      const std::vector<SyncEngineEventListener*>& listeners,
                      DebugInfoGetter* debug_info_getter,
-                     TrafficRecorder* traffic_recorder);
+                     TrafficRecorder* traffic_recorder,
+                     bool keystore_encryption_enabled);
+
   ~SyncSessionContext();
 
   ConflictResolver* resolver() { return resolver_; }
   ServerConnectionManager* connection_manager() {
     return connection_manager_;
   }
   syncable::Directory* directory() {
     return directory_;
   }
 
@@ skipping 41 matching lines @@
 
   void NotifyListeners(const SyncEngineEvent& event) {
     FOR_EACH_OBSERVER(SyncEngineEventListener, listeners_,
                       OnSyncEngineEvent(event));
   }
 
   TrafficRecorder* traffic_recorder() {
     return traffic_recorder_;
   }
 
+  bool keystore_encryption_enabled() const {
+    return keystore_encryption_enabled_;
+  }
+
  private:
   // Rather than force clients to set and null-out various context members, we
   // extend our encapsulation boundary to scoped helpers that take care of this
   // once they are allocated. See definitions of these below.
   friend class ScopedSessionContextConflictResolver;
   friend class TestScopedSessionEventListener;
 
   // This is installed by Syncer objects when needed and may be NULL.
   ConflictResolver* resolver_;
 
@@ skipping 24 matching lines @@
   int max_commit_batch_size_;
 
   ThrottledDataTypeTracker* throttled_data_type_tracker_;
 
   // We use this to get debug info to send to the server for debugging
   // client behavior on server side.
   DebugInfoGetter* const debug_info_getter_;
 
   TrafficRecorder* traffic_recorder_;
 
+  // Temporary variable while keystore encryption is behind a flag. True if
+  // we should attempt performing keystore encryption related work, false if
+  // the experiment is not enabled.
+  bool keystore_encryption_enabled_;
+
   DISALLOW_COPY_AND_ASSIGN(SyncSessionContext);
 };
 
 // Installs a ConflictResolver to a given session context for the lifetime of
 // the ScopedSessionContextConflictResolver.  There should never be more than
 // one ConflictResolver in the system, so it is an error to use this if the
 // context already has a resolver.
 class ScopedSessionContextConflictResolver {
  public:
   // Note: |context| and |resolver| should outlive |this|.
@@ skipping 10 matching lines @@
  private:
   SyncSessionContext* context_;
   ConflictResolver* resolver_;
   DISALLOW_COPY_AND_ASSIGN(ScopedSessionContextConflictResolver);
 };
 
 }  // namespace sessions
 }  // namespace syncer
 
 #endif  // SYNC_SESSIONS_SYNC_SESSION_CONTEXT_H_