Pref service: expose all read-only PrefStores through Mojo

services/preferences/public/cpp/pref_store_adapter.cc

Index: services/preferences/public/cpp/pref_store_adapter.cc
diff --git a/services/preferences/public/cpp/pref_store_adapter.cc b/services/preferences/public/cpp/pref_store_adapter.cc
new file mode 100644
index 0000000000000000000000000000000000000000..211b3c5dd418de58b800574b18e4b6453b04fde7
--- /dev/null
+++ b/services/preferences/public/cpp/pref_store_adapter.cc
@@ -0,0 +1,40 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "services/preferences/public/cpp/pref_store_adapter.h"
+
+namespace prefs {
+
+PrefStoreAdapter::PrefStoreAdapter(scoped_refptr<PrefStore> pref_store,
+                                   std::unique_ptr<PrefStoreImpl> impl)
+    : pref_store_(std::move(pref_store)), impl_(std::move(impl)) {}
+
+PrefStoreAdapter::~PrefStoreAdapter() = default;
+
+void PrefStoreAdapter::AddObserver(PrefStore::Observer* observer) {
+  pref_store_->AddObserver(observer);
+}
+
+void PrefStoreAdapter::RemoveObserver(PrefStore::Observer* observer) {
+  pref_store_->RemoveObserver(observer);
+}
+
+bool PrefStoreAdapter::HasObservers() const {
+  return pref_store_->HasObservers();
+}
+
+bool PrefStoreAdapter::IsInitializationComplete() const {
+  return pref_store_->IsInitializationComplete();
+}
+
+bool PrefStoreAdapter::GetValue(const std::string& key,
+                                const base::Value** result) const {
+  return pref_store_->GetValue(key, result);
+}
+
+std::unique_ptr<base::DictionaryValue> PrefStoreAdapter::GetValues() const {
+  return pref_store_->GetValues();
+}
+
+}  // namespace prefs