[Sync] Make P2PNotifier behave more like InvalidationNotifier

base/values.cc

Index: base/values.cc
diff --git a/base/values.cc b/base/values.cc
index ad534696b389b537dc4333876c78f9a84247583a..cc2ebf625a1fafefa6701aec8b404e8894db28b6 100644
--- a/base/values.cc
+++ b/base/values.cc
@@ -133,6 +133,14 @@ bool Value::GetAsList(const ListValue** out_value) const {
   return false;
 }
 
+bool Value::GetAsDictionary(DictionaryValue** out_value) {
+  return false;
+}
+
+bool Value::GetAsDictionary(const DictionaryValue** out_value) const {
+  return false;
+}
+
 Value* Value::DeepCopy() const {
   // This method should only be getting called for null Values--all subclasses
   // need to provide their own implementation;.
@@ -642,6 +650,19 @@ bool DictionaryValue::RemoveWithoutPathExpansion(const std::string& key,
   return true;
 }
 
+bool DictionaryValue::GetAsDictionary(DictionaryValue** out_value) {
+  if (out_value)
+    *out_value = this;
+  return true;
+}
+
+bool DictionaryValue::GetAsDictionary(
+    const DictionaryValue** out_value) const {
+  if (out_value)
+    *out_value = this;
+  return true;
+}
+
 DictionaryValue* DictionaryValue::DeepCopyWithoutEmptyChildren() {
   Value* copy = CopyWithoutEmptyChildren(this);
   return copy ? static_cast<DictionaryValue*>(copy) : new DictionaryValue;