Implement new SyncAPI and convert Preferences to it.

chrome/chrome_browser.gypi

Index: chrome/chrome_browser.gypi
diff --git a/chrome/chrome_browser.gypi b/chrome/chrome_browser.gypi
index edd0a824fb63a0e98120eb19d03e710a97d950b7..981c93d102b01d3955beeb6b2e6314a22afeeece 100644
--- a/chrome/chrome_browser.gypi
+++ b/chrome/chrome_browser.gypi
@@ -1951,6 +1951,8 @@
         'browser/sync/glue/session_data_type_controller.h',
         'browser/sync/glue/session_model_associator.cc',
         'browser/sync/glue/session_model_associator.h',
+        'browser/sync/glue/syncable_service_adapter.cc',
+        'browser/sync/glue/syncable_service_adapter.h',        
         'browser/sync/glue/sync_backend_host.cc',
         'browser/sync/glue/sync_backend_host.h',
         'browser/sync/glue/theme_change_processor.cc',
@@ -1979,10 +1981,15 @@
         'browser/sync/profile_sync_service_harness.cc',
         'browser/sync/profile_sync_service_harness.h',
         'browser/sync/profile_sync_service_observer.h',
+        'browser/sync/api/syncable_service.cc',
+        'browser/sync/api/syncable_service.h',
+        'browser/sync/api/sync_data.h',
+        'browser/sync/api/sync_data.cc',

[akalin, 2011/05/19 00:58:45]

can you move the api stuff to its own target?  (if it's not too hairy)

[Nicolas Zea, 2011/05/19 21:17:45]

I suppose I could, but what would be the benefit? This is definitely a part of
the browser in my view.

[akalin, 2011/05/20 00:08:05]

Well by that logic, we should just have everything in one 'browser' target,
since we're writing a browser. :-)

Currently the sync code is a hairball of tangled dependencies that is nearly
impossible to modularize.  Given that this is mostly new code, I'd like to not
add to the hairball, although this might end up being infeasible (if the api
stuff depends back on browser).

[Nicolas Zea, 2011/05/20 02:00:28]

Discussed offline

+        'browser/sync/api/sync_event.h',
+        'browser/sync/api/sync_event.cc',
+        'browser/sync/api/sync_event_processor.h',
         'browser/sync/signin_manager.cc',
         'browser/sync/signin_manager.h',
-        'browser/sync/syncable_service.cc',
-        'browser/sync/syncable_service.h',
         'browser/sync/sync_setup_flow.cc',
         'browser/sync/sync_setup_flow.h',
         'browser/sync/sync_setup_flow_handler.h',