Basic framework for Budget API.

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

Index: third_party/WebKit/Source/modules/budget/NavigatorBudget.idl
diff --git a/third_party/WebKit/Source/modules/budget/NavigatorBudget.idl b/third_party/WebKit/Source/modules/budget/NavigatorBudget.idl
new file mode 100644
index 0000000000000000000000000000000000000000..7c877f8c6b9480cc0dfcec809edf746b8f177b55
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+++ b/third_party/WebKit/Source/modules/budget/NavigatorBudget.idl
@@ -0,0 +1,17 @@
+// 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=Budget
+] partial interface Navigator {
+    [CallWith=ScriptState] Promise<double> getCost(ActionType actionType);
+    [CallWith=ScriptState, RaisesException] Promise<double> getBudget();
+    [CallWith=ScriptState, RaisesException] Promise<FrozenArray<BudgetChunk>> getBudgetDetails();
+};