Cashew: implement backend usage API

src/default_policy.cc

Index: src/default_policy.cc
diff --git a/src/default_policy.cc b/src/default_policy.cc
new file mode 100644
index 0000000000000000000000000000000000000000..90f754f17b7c0f0a705f4880291e8786272c64ae
--- /dev/null
+++ b/src/default_policy.cc
@@ -0,0 +1,36 @@
+// Copyright (c) 2010 The Chromium OS 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 "src/default_policy.h"
+
+#include <glog/logging.h>
+
+namespace cashew {
+
+// default update timer interval in seconds
+static const guint kDefaultPolicyUpdateTimerIdleSecs = 60;
+
+DefaultPolicy::DefaultPolicy(const std::string& carrier) : carrier_(carrier) {
+}
+
+DefaultPolicy::~DefaultPolicy() {
+}
+
+const std::string& DefaultPolicy::GetCarrier() const {
+  return carrier_;
+}
+
+guint DefaultPolicy::GetUpdateTimerIdleSecs(const DataPlanList& plans) const {
+  return kDefaultPolicyUpdateTimerIdleSecs;
+}
+
+bool DefaultPolicy::ShouldEmitDataPlansUpdate(const DataPlanList& old_plans,
+    const DataPlanList& new_plans) const {
+  // unconditionally send an update
+  return true;
+}
+
+// private methods
+
+}  // namespace cashew