Basic framework for Budget API.

third_party/WebKit/Source/modules/budget/Budget.idl

Index: third_party/WebKit/Source/modules/budget/Budget.idl
diff --git a/third_party/WebKit/Source/modules/budget/Budget.idl b/third_party/WebKit/Source/modules/budget/Budget.idl
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+// 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.
+
+// https://beverloo.github.io/budget-api/#budget-service-interface
+// TODO(harkness): Link WICG spec when it exists.
+
+enum ActionType {
+    "silent-push"
+};
+
+[
+    RuntimeEnabled=Budget
+] interface Budget {
+    [CallWith=ScriptState] Promise<double> getCost(ActionType actionType);
+    [CallWith=ScriptState] Promise<FrozenArray<BudgetChunk>> getBudget();
+};