Cast: Update simulator tool with more inputs.

media/cast/test/proto/network_simulation_model.proto

+// Copyright 2014 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.
+
+// Contains parameters for a network simulation model.
+
+syntax = "proto2";
+
+option optimize_for = LITE_RUNTIME;
+
+package media.cast.proto;
+
+message NetworkSimulationModel {
+  optional NetworkSimulationModelType type = 1;
+  optional IPPModel ipp = 2;
+}
+
+enum NetworkSimulationModelType {
+  INTERRUPTED_POISSON_PROCESS = 1;
+}
+
+message IPPModel {
+  optional double coef_burstiness = 1;
+  optional double coef_variance = 2;
+  repeated double average_rate = 3;
+}
+