Add IDL and initial Blink API for Background Sync

Source/modules/background_sync/SyncCallbacks.h

Index: Source/modules/background_sync/SyncCallbacks.h
diff --git a/Source/modules/background_sync/SyncCallbacks.h b/Source/modules/background_sync/SyncCallbacks.h
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+// 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.
+
+#ifndef SyncCallbacks_h
+#define SyncCallbacks_h
+
+#include "platform/heap/Handle.h"
+#include "public/platform/WebCallbacks.h"
+#include "public/platform/modules/background_sync/WebSyncProvider.h"
+#include "public/platform/modules/background_sync/WebSyncRegistration.h"
+#include "wtf/Noncopyable.h"
+#include "wtf/PassRefPtr.h"
+#include "wtf/RefPtr.h"
+
+namespace blink {
+
+class ServiceWorkerRegistration;
+class ScriptPromiseResolver;
+struct WebSyncError;
+struct WebSyncRegistration;
+class WebString;
+
+using WebSyncGetRegistrationsCallbacks = WebCallbacks<WebVector<WebSyncRegistration>, WebSyncError>;
+
+// SyncRegistrationCallbacks is an implementation of WebSyncRegistrationCallbacks
+// that will resolve the underlying promise depending on the result passed to
+// the callback. It takes a ServiceWorkerRegistration in its constructor and
+// will pass it to the SyncRegistration.
+class SyncRegistrationCallbacks final : public WebCallbacks<WebSyncRegistration, WebSyncError> {
+    WTF_MAKE_NONCOPYABLE(SyncRegistrationCallbacks);
+public:
+    SyncRegistrationCallbacks(PassRefPtrWillBeRawPtr<ScriptPromiseResolver>, ServiceWorkerRegistration*);
+    ~SyncRegistrationCallbacks() override;
+
+    void onSuccess(WebSyncRegistration*) override;
+    void onError(WebSyncError*) override;
+
+private:
+    RefPtrWillBePersistent<ScriptPromiseResolver> m_resolver;
+    Persistent<ServiceWorkerRegistration> m_serviceWorkerRegistration;
+};
+
+// SyncUnregistrationCallbacks is an implementation of
+// WebSyncUnregistrationCallbacks that will resolve the underlying promise
+// depending on the result passed to the callback. It takes a
+// ServiceWorkerRegistration in its constructor and will pass it to the
+// SyncProvider.
+class SyncUnregistrationCallbacks final : public WebCallbacks<bool, WebSyncError> {
+    WTF_MAKE_NONCOPYABLE(SyncUnregistrationCallbacks);
+public:
+    SyncUnregistrationCallbacks(PassRefPtrWillBeRawPtr<ScriptPromiseResolver>, ServiceWorkerRegistration*);
+    ~SyncUnregistrationCallbacks() override;
+
+    void onSuccess(bool*) override;
+    void onError(WebSyncError*) override;
+
+private:
+    RefPtrWillBePersistent<ScriptPromiseResolver> m_resolver;
+    Persistent<ServiceWorkerRegistration> m_serviceWorkerRegistration;
+};
+
+// SyncGetRegistrationsCallbacks is an implementation of WebSyncGetRegistrationsCallbacks
+// that will resolve the underlying promise depending on the result passed to
+// the callback. It takes a ServiceWorkerRegistration in its constructor and
+// will pass it to the SyncRegistration.
+class SyncGetRegistrationsCallbacks final : public WebCallbacks<WebVector<WebSyncRegistration>, WebSyncError> {
+    WTF_MAKE_NONCOPYABLE(SyncGetRegistrationsCallbacks);
+public:
+    SyncGetRegistrationsCallbacks(PassRefPtrWillBeRawPtr<ScriptPromiseResolver>, ServiceWorkerRegistration*);
+    ~SyncGetRegistrationsCallbacks() override;
+
+    void onSuccess(WebVector<WebSyncRegistration>*) override;
+    void onError(WebSyncError*) override;
+
+private:
+    RefPtrWillBePersistent<ScriptPromiseResolver> m_resolver;
+    Persistent<ServiceWorkerRegistration> m_serviceWorkerRegistration;
+};
+
+} // namespace blink
+
+#endif // SyncCallbacks_h