Add WorkerSettings to expose certain flag values in WorkerGlobalScope

third_party/WebKit/Source/core/workers/WorkerSettings.cpp

Index: third_party/WebKit/Source/core/workers/WorkerSettings.cpp
diff --git a/third_party/WebKit/Source/core/workers/WorkerSettings.cpp b/third_party/WebKit/Source/core/workers/WorkerSettings.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..80bdedc840b077b9bbe690b2afd8cf8c9a129b65
--- /dev/null
+++ b/third_party/WebKit/Source/core/workers/WorkerSettings.cpp
@@ -0,0 +1,47 @@
+// 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 "core/workers/WorkerSettings.h"
+
+#include "core/workers/WorkerGlobalScope.h"
+
+namespace blink {
+
+const char* WorkerSettings::supplementName()
+{
+    return "WorkerSettings";
+}
+
+WorkerSettings* WorkerSettings::create(Settings* settings)
+{
+    WorkerSettings* workerSettings = new WorkerSettings();
+    workerSettings->copyFlagValuesFromSettings(settings);
+    return workerSettings;
+}
+
+WorkerSettings* WorkerSettings::from(ExecutionContext* context)
+{
+    if (context->isWorkerGlobalScope()) {
+        WorkerClients* clients = toWorkerGlobalScope(*context).clients();
+        DCHECK(clients);
+        return static_cast<WorkerSettings*>(Supplement<WorkerClients>::from(clients, supplementName()));
+    }
+    return nullptr;
+}
+
+void WorkerSettings::copyFlagValuesFromSettings(Settings* settings)
+{
+    m_disableReadingFromCanvas = settings->disableReadingFromCanvas();
+}
+
+void provideWorkerSettingsToWorker(WorkerClients* clients, WorkerSettings* client)
+{
+    clients->provideSupplement(WorkerSettings::supplementName(), client);
+}
+
+DEFINE_TRACE(WorkerSettings)
+{
+    Supplement<WorkerClients>::trace(visitor);
+}
+}