[BackgroundSync] Initial land of the BackgroundSyncManager

content/browser/background_sync/background_sync.proto

Index: content/browser/background_sync/background_sync.proto
diff --git a/content/browser/background_sync/background_sync.proto b/content/browser/background_sync/background_sync.proto
new file mode 100644
index 0000000000000000000000000000000000000000..a4e15f3ba134c53da3f5d441b7073b31a81438e4
--- /dev/null
+++ b/content/browser/background_sync/background_sync.proto
@@ -0,0 +1,17 @@
+// 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.
+
+syntax = "proto2";
+
+option optimize_for = LITE_RUNTIME;
+
+package content;
+
+message BackgroundSyncRegistrationProto {
+  required string id = 1;
+}
+
+message BackgroundSyncRegistrationsProto {
+  repeated BackgroundSyncRegistrationProto registration = 1;
+}