sync: Populate entity counts in about:sync tab

sync/internal_api/public/sessions/status_counters.cc

Index: sync/internal_api/public/sessions/status_counters.cc
diff --git a/sync/internal_api/public/sessions/status_counters.cc b/sync/internal_api/public/sessions/status_counters.cc
index 48c94d90c5d738f8a30de1a067190972cecc3a92..9a5dcb69efb1e96cda4592048ebb22d08d3837fe 100644
--- a/sync/internal_api/public/sessions/status_counters.cc
+++ b/sync/internal_api/public/sessions/status_counters.cc
@@ -10,13 +10,15 @@
 namespace syncer {
 
 StatusCounters::StatusCounters()
-  : num_entries(0) {}
+  : num_entries(0),
+    num_entries_and_tombstones(0) {}
 
 StatusCounters::~StatusCounters() {}
 
 scoped_ptr<base::DictionaryValue> StatusCounters::ToValue() const {
   scoped_ptr<base::DictionaryValue> value(new base::DictionaryValue());
   value->SetInteger("numEntries", num_entries);
+  value->SetInteger("numEntriesAndTombstones", num_entries_and_tombstones);
   return value.Pass();
 }