Download Service : Added leveldb proto layer

components/download/internal/proto/scheduling.proto

+// 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.
+
+syntax = "proto2";
+
+option optimize_for = LITE_RUNTIME;
+
+package protodb;
+
+// Stores the scheduling params associated with a download request.
+message SchedulingParams {
+  // This should stay in sync with the NetworkRequirements enum
+  // (components/download/public/download_params.h).
+  enum NetworkRequirements {
+    NONE = 0;
+    OPTIMISTIC = 1;
+    UNMETERED = 2;
+  }
+
+  // This should stay in sync with the BatteryRequirements enum
+  // (components/download/public/download_params.h).
+  enum BatteryRequirements {
+    BATTERY_INSENSITIVE = 0;
+    BATTERY_SENSITIVE = 1;
+  }
+
+  // This should stay in sync with the Priority enum
+  // (components/download/public/download_params.h).
+  enum Priority {
+    LOW = 0;
+    NORMAL = 1;
+    HIGH = 2;
+    UI = 3;
+  }
+
+  // Uses internal time representation.
+  optional int64 cancel_time = 2;
+
+  optional Priority priority = 3;
+  optional NetworkRequirements network_requirements = 4;
+  optional BatteryRequirements battery_requirements = 5;
+}