Implement SyncableServices in TemplateURLService. Add related unittests.

chrome/browser/sync/api/sync_change.cc

Index: chrome/browser/sync/api/sync_change.cc
===================================================================
--- chrome/browser/sync/api/sync_change.cc	(revision 97053)
+++ chrome/browser/sync/api/sync_change.cc	(working copy)
@@ -42,3 +42,20 @@
 SyncData SyncChange::sync_data() const {
   return sync_data_;
 }
+
+// static
+std::string SyncChange::ChangeTypeToString(SyncChangeType change_type) {
+  switch (change_type) {
+    case ACTION_INVALID:
+      return "ACTION_INVALID";
+    case ACTION_ADD:
+      return "ACTION_ADD";
+    case ACTION_UPDATE:
+      return "ACTION_UPDATE";
+    case ACTION_DELETE:
+      return "ACTION_DELETE";
+    default:
+      NOTREACHED();
+  }
+  return std::string();
+}