Beginnings of BackgroundFetch idl implementation

third_party/WebKit/Source/modules/background_fetch/BackgroundFetchManager.idl

Index: third_party/WebKit/Source/modules/background_fetch/BackgroundFetchManager.idl
diff --git a/third_party/WebKit/Source/modules/background_fetch/BackgroundFetchManager.idl b/third_party/WebKit/Source/modules/background_fetch/BackgroundFetchManager.idl
new file mode 100644
index 0000000000000000000000000000000000000000..11ec0a9bb4dce615d8d3d147c1e741610998651b
--- /dev/null
+++ b/third_party/WebKit/Source/modules/background_fetch/BackgroundFetchManager.idl
@@ -0,0 +1,12 @@
+// Copyright 2017 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.
+
+// https://wicg.github.io/background-fetch/#background-fetch-manager
+
+[
+    Exposed=(Window, Worker),
+    RuntimeEnabled=BackgroundFetch
+] interface BackgroundFetchManager {
+  [CallWith=ScriptState] Promise<DOMString> getTags();
+};