Add updater state for Mac.

components/update_client/updater_state.cc

Index: components/update_client/updater_state.cc
diff --git a/components/update_client/updater_state.cc b/components/update_client/updater_state.cc
index 035e6c2f2302ec3e78fc02b1737488c6b81017da..f7beb25cc18586537585b95695338cca1c91824a 100644
--- a/components/update_client/updater_state.cc
+++ b/components/update_client/updater_state.cc
@@ -23,16 +23,16 @@ UpdaterState::~UpdaterState() {}
 
 std::unique_ptr<UpdaterState::Attributes> UpdaterState::GetState(
     bool is_machine) {
-#if defined(OS_WIN)
+#if defined(OS_WIN) || defined(OS_MACOSX)
   UpdaterState updater_state(is_machine);
   updater_state.ReadState();
   return base::MakeUnique<Attributes>(updater_state.BuildAttributes());
 #else
   return nullptr;
-#endif  // OS_WIN
+#endif  // OS_WIN and OS_MACOSX
 }
 
-#if defined(OS_WIN)
+#if defined(OS_WIN) || defined(OS_MACOSX)
 void UpdaterState::ReadState() {
   is_joined_to_domain_ = IsJoinedToDomain();
 
@@ -45,7 +45,7 @@ void UpdaterState::ReadState() {
   update_policy_ = GetUpdatePolicy();
 #endif  // GOOGLE_CHROME_BUILD
 }
-#endif  // OS_WIN
+#endif  // OS_WIN and OS_MACOSX
 
 UpdaterState::Attributes UpdaterState::BuildAttributes() const {
   Attributes attributes;