Basic framework for Budget API.

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

Index: third_party/WebKit/Source/modules/budget_service/NavigatorBudget.idl
diff --git a/third_party/WebKit/Source/modules/budget_service/NavigatorBudget.idl b/third_party/WebKit/Source/modules/budget_service/NavigatorBudget.idl
new file mode 100644
index 0000000000000000000000000000000000000000..d668bbeb1386c8b0dcc69ce749206f14ffb3f8d1
--- /dev/null
+++ b/third_party/WebKit/Source/modules/budget_service/NavigatorBudget.idl
@@ -0,0 +1,15 @@
+// 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.
+
+// TODO(harkness) Add reference to W3C standard doc.
+
+enum ActionType {
+    "SILENT_PUSH"
+};
+[
+    RuntimeEnabled=BudgetService
+] partial interface Navigator {
+    [CallWith=ScriptState] Promise<double> getCost(ActionType actionType);
+    [CallWith=ScriptState, RaisesException] Promise<double> getBudget();
+};