Basic framework for Budget API.

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

+// 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.
+
+#include "modules/budget_service/NavigatorBudget.h"
+
+#include "bindings/core/v8/ScriptPromise.h"
+#include "bindings/core/v8/ScriptPromiseResolver.h"
+#include "bindings/core/v8/ScriptState.h"
+#include "core/dom/ExceptionCode.h"
+#include "core/frame/Navigator.h"
+
+namespace blink {
+
+NavigatorBudget::NavigatorBudget(Navigator& navigator)
+{
+}
+
+NavigatorBudget::~NavigatorBudget() {}
+
+// Static
+const char* NavigatorBudget::supplementName()
+{
+    return "NavigatorBudget";
+}
+
+// Static
+NavigatorBudget& NavigatorBudget::from(Navigator& navigator)
+{
+    // Get the unique NavigatorBudget associated with this navigator.
+    NavigatorBudget* navigatorBudget = static_cast<NavigatorBudget*>(Supplement<Navigator>::from(navigator, supplementName()));
+    if (!navigatorBudget) {
+        // If there has not already been a NavigatorBudget created for
+        // this navigator, create one now and associate it.
+        navigatorBudget = new NavigatorBudget(navigator);
+        Supplement<Navigator>::provideTo(navigator, supplementName(), navigatorBudget);
+    }
+    return *navigatorBudget;
+}
+
+// Static
+ScriptPromise NavigatorBudget::getCost(ScriptState* state,
+    Navigator& navigator,
+    const AtomicString& actionType)
+{
+    ScriptPromiseResolver* resolver = ScriptPromiseResolver::create(state);
+    ScriptPromise promise = resolver->promise();
+
+    // TODO(harkness): Trigger the cost calculation.
+    return promise;
+}
+
+// Static
+ScriptPromise NavigatorBudget::getBudget(ScriptState* state,
+    Navigator& navigator,
+    ExceptionState& exception)
+{
+    ScriptPromiseResolver* resolver = ScriptPromiseResolver::create(state);
+    ScriptPromise promise = resolver->promise();
+
+    // TODO(harkness): Trigger the budget calculation.
+    return promise;
+}
+
+} // namespace blink