Adding notifications for new sync types.

chrome/browser/sync/syncable/model_type.cc

Index: chrome/browser/sync/syncable/model_type.cc
diff --git a/chrome/browser/sync/syncable/model_type.cc b/chrome/browser/sync/syncable/model_type.cc
index 28bafef06e1507c43c375cbd10757673f0874625..2027131899d68d8429cd90f10636d0a864ff422e 100644
--- a/chrome/browser/sync/syncable/model_type.cc
+++ b/chrome/browser/sync/syncable/model_type.cc
@@ -5,6 +5,7 @@
 #include "chrome/browser/sync/syncable/model_type.h"
 
 #include "base/metrics/histogram.h"
+#include "base/string_split.h"
 #include "base/values.h"
 #include "chrome/browser/sync/engine/syncproto.h"
 #include "chrome/browser/sync/protocol/app_specifics.pb.h"
@@ -302,11 +303,23 @@ bool ModelTypeBitSetFromString(
     const std::string& model_type_bitset_string,
     ModelTypeBitSet* model_types) {
   DCHECK(model_types);
-  if (model_type_bitset_string.length() != MODEL_TYPE_COUNT)
-    return false;
-  if (model_type_bitset_string.find_first_not_of("01") != std::string::npos)
-    return false;
-  *model_types = ModelTypeBitSet(model_type_bitset_string);
+  ModelTypeBitSet bitset;
+  if (!model_type_bitset_string.empty()) {
+    std::vector<std::string> types;
+    // Parse the comma-delimited list of types.
+    base::SplitString(model_type_bitset_string, ',', &types);
+
+    // Walk the list of types and set them in our ModelTypeBitSet.
+    for (std::vector<std::string>::const_iterator it = types.begin();
+         it != types.end();
+         ++it) {
+      ModelType type = ModelTypeFromString(*it);
+      if (type == UNSPECIFIED)
+        return false;
+      bitset.set(type);
+    }
+  }
+  *model_types = bitset;
   return true;
 }