Add Data Saver support to Cronet

components/cronet/android/cronet_pref_store.cc

Index: components/cronet/android/cronet_pref_store.cc
diff --git a/components/cronet/android/cronet_pref_store.cc b/components/cronet/android/cronet_pref_store.cc
new file mode 100644
index 0000000000000000000000000000000000000000..057abd6a42d7b3f53e072dbdf474db00db51933c
--- /dev/null
+++ b/components/cronet/android/cronet_pref_store.cc
@@ -0,0 +1,74 @@
+// 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_pref_store.h"
+
+#include "base/memory/scoped_ptr.h"
+#include "base/values.h"
+
+CronetPrefStore::CronetPrefStore() {}
+
+CronetPrefStore::~CronetPrefStore() {}
+
+bool CronetPrefStore::GetValue(const std::string& key,
+                           const base::Value** value) const {
+  return prefs_.GetValue(key, value);
+}
+
+bool CronetPrefStore::GetMutableValue(const std::string& key,
+                                  base::Value** value) {
+  return prefs_.GetValue(key, value);
+}
+
+void CronetPrefStore::AddObserver(PrefStore::Observer* observer) {
+  observers_.AddObserver(observer);
+}
+
+void CronetPrefStore::RemoveObserver(PrefStore::Observer* observer) {
+  observers_.RemoveObserver(observer);
+}
+
+bool CronetPrefStore::HasObservers() const {
+  return observers_.might_have_observers();
+}
+
+bool CronetPrefStore::IsInitializationComplete() const {
+  return true;
+}
+
+void CronetPrefStore::SetValue(const std::string& key, base::Value* value) {
+  DCHECK(value);
+  if (prefs_.SetValue(key, value))
+      ReportValueChanged(key);
+}
+
+void CronetPrefStore::SetValueSilently(const std::string& key,
+                                       base::Value* value) {
+  prefs_.SetValue(key, value);
+}
+
+void CronetPrefStore::RemoveValue(const std::string& key) {
+  if (prefs_.RemoveValue(key))
+    ReportValueChanged(key);
+}
+
+bool CronetPrefStore::ReadOnly() const {
+  return false;
+}
+
+PersistentPrefStore::PrefReadError CronetPrefStore::GetReadError() const {
+  return PersistentPrefStore::PREF_READ_ERROR_NONE;
+}
+
+PersistentPrefStore::PrefReadError CronetPrefStore::ReadPrefs() {
+  return PersistentPrefStore::PREF_READ_ERROR_NONE;
+}
+
+void CronetPrefStore::ReadPrefsAsync(ReadErrorDelegate* error_delegate_raw) {
+}
+
+void CronetPrefStore::ReportValueChanged(const std::string& key) {
+  FOR_EACH_OBSERVER(Observer, observers_, OnPrefValueChanged(key));
+}
+