Add IDL and initial Blink API for Background Sync

Source/modules/background_sync/SyncManager.h

-// Copyright 2014 The Chromium Authors. All rights reserved.
+// 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 Geofencing_h
-#define Geofencing_h
+#ifndef SyncManager_h
+#define SyncManager_h
 
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "platform/heap/Handle.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
-class GeofencingRegion;
+class SyncRegistrationOptions;
 class ScriptPromise;
 class ScriptState;
 class ServiceWorkerRegistration;
 
-class Geofencing final : public GarbageCollected<Geofencing>, public ScriptWrappable {
+class SyncManager final : public GarbageCollectedFinalized<SyncManager> , public ScriptWrappable {
     DEFINE_WRAPPERTYPEINFO();
 public:
-    static Geofencing* create(ServiceWorkerRegistration* registration)
+    static SyncManager* create(ServiceWorkerRegistration* registration)
     {
-        return new Geofencing(registration);
+        return new SyncManager(registration);
     }
+    ~SyncManager() { }
 
-    ScriptPromise registerRegion(ScriptState*, GeofencingRegion*);
-    ScriptPromise unregisterRegion(ScriptState*, const String& regionId);
-    ScriptPromise getRegisteredRegions(ScriptState*) const;
+    unsigned long minAllowablePeriod();
 
-    DECLARE_VIRTUAL_TRACE();
+    ScriptPromise registerFunction(ScriptState*);
+    ScriptPromise registerFunction(ScriptState*, const SyncRegistrationOptions&);
+    ScriptPromise getRegistration(blink::ScriptState*, const String&);
+    ScriptPromise getRegistrations(ScriptState*);
+
+    DECLARE_TRACE();
 
 private:
-    explicit Geofencing(ServiceWorkerRegistration*);
+    explicit SyncManager(ServiceWorkerRegistration*);
 
     Member<ServiceWorkerRegistration> m_registration;
 };
 
 } // namespace blink
 
-#endif // Geofencing_h
+#endif // SyncManager_h