Cashew: implement backend usage API

src/default_policy.h

Index: src/default_policy.h
diff --git a/src/default_policy.h b/src/default_policy.h
new file mode 100644
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--- /dev/null
+++ b/src/default_policy.h
@@ -0,0 +1,39 @@
+// 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.
+
+#ifndef SRC_DEFAULT_POLICY_H_
+#define SRC_DEFAULT_POLICY_H_
+
+#include <string>
+
+#include <base/basictypes.h>  // NOLINT
+
+#include "src/policy.h"
+
+namespace cashew {
+
+// a bare-bones default carrier policy
+class DefaultPolicy: public Policy {
+  public:
+
+    explicit DefaultPolicy(const std::string& carrier);
+    virtual ~DefaultPolicy();
+
+    virtual const std::string& GetCarrier() const;
+
+    virtual guint GetUpdateTimerIdleSecs(const DataPlanList& plans) const;
+
+    virtual bool ShouldEmitDataPlansUpdate(const DataPlanList& old_plans,
+        const DataPlanList& new_plans) const;
+
+  private:
+    // carrier
+    const std::string carrier_;
+
+    DISALLOW_COPY_AND_ASSIGN(DefaultPolicy);
+};
+
+}  // namespace cashew
+
+#endif  // SRC_DEFAULT_POLICY_H_