Added classes to enable session sync functionality....

chrome/browser/sync/profile_sync_service.h

Index: chrome/browser/sync/profile_sync_service.h
===================================================================
--- chrome/browser/sync/profile_sync_service.h	(revision 56023)
+++ chrome/browser/sync/profile_sync_service.h	(working copy)
@@ -19,6 +19,7 @@
 #include "chrome/browser/pref_member.h"
 #include "chrome/browser/sync/glue/data_type_controller.h"
 #include "chrome/browser/sync/glue/data_type_manager.h"
+#include "chrome/browser/sync/glue/session_model_associator.h"
 #include "chrome/browser/sync/glue/sync_backend_host.h"
 #include "chrome/browser/sync/notification_method.h"
 #include "chrome/browser/sync/profile_sync_service_observer.h"
@@ -128,6 +129,11 @@
   void RegisterDataTypeController(
       browser_sync::DataTypeController* data_type_controller);
 
+  // Returns the session model associator associated with this type, but only if
+  // the associator is running.  If it is doing anything else, it will return
+  // null.
+  browser_sync::SessionModelAssociator* GetSessionModelAssociator();
+
   // Fills state_map with a map of current data types that are possible to
   // sync, as well as their states.
   void GetDataTypeControllerStates(
@@ -296,6 +302,10 @@
   // NotificationService when the outcome is known.
   virtual void SetPassphrase(const std::string& passphrase);
 
+  // Returns whether processing changes is allowed.  Check this before doing
+  // any model-modifying operations.
+  bool ShouldPushChanges();
+
  protected:
   // Used by ProfileSyncServiceMock only.
   //
@@ -307,10 +317,6 @@
   // Helper to install and configure a data type manager.
   void ConfigureDataTypeManager();
 
-  // Returns whether processing changes is allowed.  Check this before doing
-  // any model-modifying operations.
-  bool ShouldPushChanges();
-
   // Starts up the backend sync components.
   void StartUp();
   // Shuts down the backend sync components.
@@ -345,6 +351,7 @@
  private:
   friend class ProfileSyncServiceTest;
   friend class ProfileSyncServicePreferenceTest;
+  friend class ProfileSyncServiceSessionTest;
   friend class ProfileSyncServiceTestHarness;
   FRIEND_TEST_ALL_PREFIXES(ProfileSyncServiceTest, InitialState);
   FRIEND_TEST_ALL_PREFIXES(ProfileSyncServiceTest,