[sensors] Introduce Generic Sensor API interfaces

device/generic_sensor/public/interfaces/sensor_struct_traits.cc

Index: device/generic_sensor/public/interfaces/sensor_struct_traits.cc
diff --git a/device/generic_sensor/public/interfaces/sensor_struct_traits.cc b/device/generic_sensor/public/interfaces/sensor_struct_traits.cc
new file mode 100644
index 0000000000000000000000000000000000000000..164e3231b49a9a9e5564d4207ae6238a582ac275
--- /dev/null
+++ b/device/generic_sensor/public/interfaces/sensor_struct_traits.cc
@@ -0,0 +1,25 @@
+// 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.
+
+#include "device/generic_sensor/public/interfaces/sensor_struct_traits.h"
+
+namespace mojo {
+
+// static
+bool StructTraits<device::mojom::SensorConfiguration,
+                  device::PlatformSensorConfiguration>::
+    Read(device::mojom::SensorConfigurationDataView data,
+         device::PlatformSensorConfiguration* out) {
+  // Maximum allowed frequency is capped to 60Hz.
+  if (data.frequency() >
+          device::PlatformSensorConfiguration::kMaxAllowedFrequency ||
+      data.frequency() <= 0.0) {
+    return false;
+  }
+
+  out->set_frequency(data.frequency());
+  return true;
+}
+
+}  // namespace mojo