Add Data Saver support to Cronet

components/cronet/android/cronet_in_memory_pref_store.cc

+// Copyright 2015 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 "components/cronet/android/cronet_in_memory_pref_store.h"
+
+#include "base/logging.h"
+#include "base/memory/scoped_ptr.h"
+
+CronetInMemoryPrefStore::CronetInMemoryPrefStore() {}
+
+CronetInMemoryPrefStore::~CronetInMemoryPrefStore() {}
+
+bool CronetInMemoryPrefStore::GetValue(const std::string& key,
+                                       const base::Value** value) const {
+  return prefs_.GetValue(key, value);
+}
+
+bool CronetInMemoryPrefStore::GetMutableValue(const std::string& key,
+                                              base::Value** value) {
+  return prefs_.GetValue(key, value);
+}
+
+void CronetInMemoryPrefStore::AddObserver(PrefStore::Observer* observer) {
+  observers_.AddObserver(observer);
+}
+
+void CronetInMemoryPrefStore::RemoveObserver(PrefStore::Observer* observer) {
+  observers_.RemoveObserver(observer);
+}
+
+bool CronetInMemoryPrefStore::HasObservers() const {
+  return observers_.might_have_observers();
+}
+
+bool CronetInMemoryPrefStore::IsInitializationComplete() const {
+  return true;
+}
+
+void CronetInMemoryPrefStore::SetValue(
+    const std::string& key, base::Value* value, uint32 flags) {
+  DCHECK(value);
+  if (prefs_.SetValue(key, value))
+    ReportValueChanged(key, flags);
+}
+
+void CronetInMemoryPrefStore::SetValueSilently(const std::string& key,
+                                               base::Value* value,
+                                               uint32 flags) {
+  prefs_.SetValue(key, value);
+}
+
+void CronetInMemoryPrefStore::RemoveValue(const std::string& key,
+                                          uint32 flags) {
+  if (prefs_.RemoveValue(key))
+    ReportValueChanged(key, flags);
+}
+
+bool CronetInMemoryPrefStore::ReadOnly() const {
+  return false;
+}
+
+PersistentPrefStore::PrefReadError
+CronetInMemoryPrefStore::GetReadError() const {
+  return PersistentPrefStore::PREF_READ_ERROR_NONE;
+}
+
+PersistentPrefStore::PrefReadError CronetInMemoryPrefStore::ReadPrefs() {
+  return PersistentPrefStore::PREF_READ_ERROR_NONE;
+}
+
+void CronetInMemoryPrefStore::ReadPrefsAsync(
+    ReadErrorDelegate* error_delegate_raw) {
+}
+
+void CronetInMemoryPrefStore::ReportValueChanged(const std::string& key,
+                                                 uint32 flags) {
+  FOR_EACH_OBSERVER(Observer, observers_, OnPrefValueChanged(key));
+}
+