Add IDL and initial Blink API for Background Sync

Source/modules/background_sync/SyncRegistrationOptions.idl

Index: Source/modules/background_sync/SyncRegistrationOptions.idl
diff --git a/Source/modules/background_sync/SyncRegistrationOptions.idl b/Source/modules/background_sync/SyncRegistrationOptions.idl
new file mode 100644
index 0000000000000000000000000000000000000000..0939ee07964495e2f73729c836f42395086d2dbb
--- /dev/null
+++ b/Source/modules/background_sync/SyncRegistrationOptions.idl
@@ -0,0 +1,22 @@
+// 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.
+
+enum SyncNetworkType {
+  "network-any",
+  "network-offline",
+  "network-online",
+  "network-non-mobile",
+};
+
+[
+    RuntimeEnabled=BackgroundSync,
+] dictionary SyncRegistrationOptions {
+    DOMString id;
+    unsigned long minDelay = 0;
+    unsigned long maxDelay = 0;
+    unsigned long minPeriod = 0;
+    SyncNetworkType minRequiredNetwork = "network-online";
+    boolean allowOnBattery = true;
+    boolean idleRequired = false;
+};