[sensors] [mac] Implement ambient light sensor for macOS

content/renderer/device_sensors/device_light_event_pump.cc

 // 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.
 
 #include "content/renderer/device_sensors/device_light_event_pump.h"
 
 #include "base/time/time.h"
 #include "content/public/renderer/render_thread.h"
+#include "device/sensors/public/cpp/device_sensors_consts.h"
 #include "third_party/WebKit/public/platform/WebDeviceLightListener.h"
 
 namespace {
 // Default rate for firing of DeviceLight events.
-const int kDefaultLightPumpFrequencyHz = 5;
 const int kDefaultLightPumpDelayMicroseconds =
-    base::Time::kMicrosecondsPerSecond / kDefaultLightPumpFrequencyHz;
+    base::Time::kMicrosecondsPerSecond /
+    device::kDefaultAmbientLightFrequencyHz;
 }  // namespace
 
 namespace content {
 
 DeviceLightEventPump::DeviceLightEventPump(RenderThread* thread)
     : DeviceSensorMojoClientMixin<
           DeviceSensorEventPump<blink::WebDeviceLightListener>,
           device::mojom::LightSensor>(thread),
       last_seen_data_(-1) {
   pump_delay_microseconds_ = kDefaultLightPumpDelayMicroseconds;
@@ skipping 29 matching lines @@
   return reader_->Initialize(handle);
 }
 
 void DeviceLightEventPump::SendFakeDataForTesting(void* fake_data) {
   double data = *static_cast<double*>(fake_data);
 
   listener()->didChangeDeviceLight(data);
 }
 
 }  // namespace content