Download Service : Added leveldb proto layer

components/download/internal/proto/BUILD.gn

Index: components/download/internal/proto/BUILD.gn
diff --git a/components/download/internal/proto/BUILD.gn b/components/download/internal/proto/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..c9132cb4b113e44c0dc5dcce3fcecd0f4463e353
--- /dev/null
+++ b/components/download/internal/proto/BUILD.gn
@@ -0,0 +1,13 @@
+# 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.
+
+import("//third_party/protobuf/proto_library.gni")
+
+proto_library("proto") {
+  sources = [
+    "entry.proto",
+    "request.proto",
+    "scheduling.proto",
+  ]
+}