Implement Permissions.query() and static PermissionStatus.

Source/modules/permissions/PermissionController.cpp

+// Copyright 2015 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 "config.h"
+#include "modules/permissions/PermissionController.h"
+
+#include "core/frame/LocalFrame.h"
+#include "platform/RuntimeEnabledFeatures.h"
+#include "public/platform/modules/permissions/WebPermissionClient.h"
+
+namespace blink {
+
+PermissionController::~PermissionController()
+{
+}
+
+void PermissionController::provideTo(LocalFrame& frame, WebPermissionClient* client)
+{
+    ASSERT(RuntimeEnabledFeatures::permissionsEnabled());
+
+    PermissionController* controller = new PermissionController(frame, client);
+    WillBeHeapSupplement<LocalFrame>::provideTo(frame, supplementName(), adoptPtrWillBeNoop(controller));
+}
+
+PermissionController* PermissionController::from(LocalFrame& frame)
+{
+    return static_cast<PermissionController*>(WillBeHeapSupplement<LocalFrame>::from(frame, supplementName()));
+}
+
+PermissionController::PermissionController(LocalFrame& frame, WebPermissionClient* client)
+    : FrameDestructionObserver(&frame)
+    , m_client(client)
+{
+}
+
+const char* PermissionController::supplementName()
+{
+    return "PermissionController";
+}
+
+WebPermissionClient* PermissionController::client() const
+{
+    return m_client;
+}
+
+void PermissionController::willDetachFrameHost()
+{
+    m_client = nullptr;
+}
+
+DEFINE_TRACE(PermissionController)
+{
+    FrameDestructionObserver::trace(visitor);
+    WillBeHeapSupplement<LocalFrame>::trace(visitor);
+}
+
+} // namespace blink