Basic framework for Budget API.

third_party/WebKit/Source/modules/budget_service/NavigatorBudget.h

+// Copyright 2016 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.
+
+#ifndef NavigatorBudget_h
+#define NavigatorBudget_h
+
+#include "bindings/core/v8/ScriptWrappable.h"
+#include "modules/ModulesExport.h"
+#include "platform/Supplementable.h"
+#include "wtf/Noncopyable.h"
+
+namespace blink {
+
+class ExceptionState;
+class Navigator;
+class ScriptPromise;
+class ScriptState;
+
+// This is the entry point into the browser for the BudgetAPI, which is
+// designed to give Service Workers the ability to perform background
+// operations on the user's behalf.
+class MODULES_EXPORT NavigatorBudget final
+    : public GarbageCollectedFinalized<NavigatorBudget>
+    , public Supplement<Navigator> {
+    USING_GARBAGE_COLLECTED_MIXIN(NavigatorBudget);
+    WTF_MAKE_NONCOPYABLE(NavigatorBudget);
+
+public:

[haraken, 2016/06/29 23:45:40]

You need to add DECLARE_TRACE/DEFINE_TRACE. I guess that not having the tracing
method will lead to a compile error, but didn't it?

+    virtual ~NavigatorBudget();
+
+    const char* supplementName();
+    NavigatorBudget& from(Navigator&);
+
+    static ScriptPromise getCost(ScriptState*, Navigator&, const AtomicString& actionType);
+    static ScriptPromise getBudget(ScriptState*, Navigator&, ExceptionState&);
+
+private:
+    explicit NavigatorBudget(Navigator&);
+};
+
+} // namespace blink
+
+#endif // NavigatorBudget_h