[Sync] Initial support for encrypting any datatype (no UI hookup yet).

chrome/test/live_sync/live_sessions_sync_test.h

Index: chrome/test/live_sync/live_sessions_sync_test.h
diff --git a/chrome/test/live_sync/live_sessions_sync_test.h b/chrome/test/live_sync/live_sessions_sync_test.h
index e081ad7c8aaca1bd8aaf69a1d85495e3ca3fcf20..38a414d18ad3cf351cca4a6044c5321a6ebdb15a 100644
--- a/chrome/test/live_sync/live_sessions_sync_test.h
+++ b/chrome/test/live_sync/live_sessions_sync_test.h
@@ -16,6 +16,8 @@
 #include "chrome/browser/sessions/base_session_service.h"
 #include "chrome/browser/sessions/session_service_test_helper.h"
 #include "chrome/browser/sessions/session_types.h"
+#include "chrome/browser/sync/profile_sync_service_harness.h"
+#include "chrome/browser/sync/syncable/nigori_util.h"
 #include "chrome/test/live_sync/live_sync_test.h"
 
 class GURL;
@@ -97,6 +99,16 @@ class LiveSessionsSyncTest : public LiveSyncTest {
   // Sets up the TestSessionService helper and the new browser windows.
   bool SetupClients();
 
+  // Encrypt sessions datatype.
+  bool EnableEncryption(int index) {
+    return GetClient(index)->EnableEncryptionForType(syncable::SESSIONS);
+  }
+
+  // Check if Sessions are encrypted.
+  bool IsEncrypted(int index) {
+    return GetClient(index)->IsTypeEncrypted(syncable::SESSIONS);
+  }
+
   // Open a single tab and return the TabContents. TabContents must be checked
   // to ensure the tab opened successsfully.
   TabContents* OpenTab(int index, GURL url) WARN_UNUSED_RESULT;