[Sync] Add SyncEncryptionHandler

sync/sync.gyp

Index: sync/sync.gyp
diff --git a/sync/sync.gyp b/sync/sync.gyp
index 3143b6da3366987bb83652957ccbf233c94ed2d1..b83ca142501d24dd09dab04385b23ac369e95c94 100644
--- a/sync/sync.gyp
+++ b/sync/sync.gyp
@@ -173,6 +173,8 @@
         'syncable/model_type.cc',
         'syncable/mutable_entry.cc',
         'syncable/mutable_entry.h',
+        'syncable/nigori_handler.h',
+        'syncable/nigori_handler.cc',
         'syncable/nigori_util.cc',
         'syncable/nigori_util.h',
         'syncable/on_disk_directory_backing_store.cc',
@@ -320,6 +322,8 @@
         'internal_api/public/read_node.h',
         'internal_api/public/read_transaction.h',
         'internal_api/public/sync_manager.h',
+        'internal_api/public/sync_encryption_handler.cc',
+        'internal_api/public/sync_encryption_handler.h',
         'internal_api/public/sync_manager.cc',
         'internal_api/public/sync_manager_factory.h',
         'internal_api/public/user_share.h',
@@ -336,6 +340,8 @@
         'internal_api/internal_components_factory_impl.cc',
         'internal_api/js_mutation_event_observer.cc',
         'internal_api/js_mutation_event_observer.h',
+        'internal_api/js_sync_encryption_handler_observer.cc',
+        'internal_api/js_sync_encryption_handler_observer.h',
         'internal_api/js_sync_manager_observer.cc',
         'internal_api/js_sync_manager_observer.h',
         'internal_api/read_node.cc',
@@ -344,6 +350,8 @@
         'internal_api/syncapi_internal.h',
         'internal_api/syncapi_server_connection_manager.cc',
         'internal_api/syncapi_server_connection_manager.h',
+        'internal_api/sync_encryption_handler_impl.cc',
+        'internal_api/sync_encryption_handler_impl.h',
         'internal_api/sync_manager_factory.cc',
         'internal_api/sync_manager_impl.cc',
         'internal_api/sync_manager_impl.h',
@@ -430,6 +438,8 @@
         'test/engine/test_syncable_utils.h',
         'test/fake_encryptor.cc',
         'test/fake_encryptor.h',
+        'test/fake_sync_encryption_handler.h',
+        'test/fake_sync_encryption_handler.cc',
         'test/fake_extensions_activity_monitor.cc',
         'test/fake_extensions_activity_monitor.h',
         'test/null_directory_change_delegate.cc',
@@ -490,6 +500,7 @@
         'test_support_sync',
       ],
       'sources': [
+        'internal_api/public/test/fake_encryption_handler.h',
         'internal_api/public/test/fake_sync_manager.h',
         'internal_api/public/test/test_entry_factory.h',
         'internal_api/public/test/test_internal_components_factory.h',
@@ -706,8 +717,10 @@
           'internal_api/debug_info_event_listener_unittest.cc',
           'internal_api/http_bridge_unittest.cc',
           'internal_api/js_mutation_event_observer_unittest.cc',
+          'internal_api/js_sync_encryption_handler_observer_unittest.cc',
           'internal_api/js_sync_manager_observer_unittest.cc',
           'internal_api/syncapi_server_connection_manager_unittest.cc',
+          'internal_api/sync_encryption_handler_impl_unittest.cc',
           'internal_api/sync_manager_impl_unittest.cc',
         ],
       },