Make the launch params the default client behavior for UMA 3g

components/metrics/net/cellular_logic_helper.h

Index: components/metrics/net/cellular_logic_helper.h
diff --git a/components/metrics/net/cellular_logic_helper.h b/components/metrics/net/cellular_logic_helper.h
new file mode 100644
index 0000000000000000000000000000000000000000..b5c7061cf2d9a7e7b10dbde22f57fc51aa6e33b1
--- /dev/null
+++ b/components/metrics/net/cellular_logic_helper.h
@@ -0,0 +1,21 @@
+// Copyright 2016 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.
+
+#ifndef COMPONENTS_METRICS_NET_CELLULAR_LOGIC_HELPER_H_
+#define COMPONENTS_METRICS_NET_CELLULAR_LOGIC_HELPER_H_
+
+#include "base/time/time.h"
+
+namespace metrics {
+
+// Returns UMA log upload interval based on OS and ongoing cellular experiment.
+base::TimeDelta GetUploadInterval();
+
+// Returns true if current connection type is cellular and user is assigned to
+// experimental group for enabled cellular uploads.
+bool IsCellularLogicEnabled();
+
+}  // namespace metrics
+
+#endif  // COMPONENTS_METRICS_NET_CELLULAR_LOGIC_HELPER_H_