Implementation of the database safe worker model.

BUG=none
TEST=unit test

Review URL: http://codereview.chromium.org/546138

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@37367 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/chrome/chrome_browser.gypi b/chrome/chrome_browser.gypi
index 7676b1c..0e94ea38 100755
--- a/chrome/chrome_browser.gypi
+++ b/chrome/chrome_browser.gypi
@@ -1550,6 +1550,8 @@
         'browser/sync/glue/bookmark_model_associator.cc',
         'browser/sync/glue/change_processor.cc',
         'browser/sync/glue/change_processor.h',
+        'browser/sync/glue/database_model_worker.cc',
+        'browser/sync/glue/database_model_worker.h',
         'browser/sync/glue/http_bridge.cc',
         'browser/sync/glue/http_bridge.h',
         'browser/sync/glue/model_associator.h',