[Sensors] Layouts test to check frequency hint

third_party/WebKit/Source/modules/sensor/SensorProxy.cpp

 // 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 "modules/sensor/SensorProxy.h"
 
 #include "core/frame/LocalFrame.h"
 #include "modules/sensor/SensorProviderProxy.h"
 #include "modules/sensor/SensorReading.h"
 #include "platform/mojo/MojoHelper.h"
@@ skipping 128 matching lines @@
 
   for (Observer* observer : m_observers)
     observer->onSensorReadingChanged();
 }
 
 void SensorProxy::RaiseError() {
   handleSensorError();
 }
 
 void SensorProxy::SensorReadingChanged() {
+  DCHECK_EQ(ReportingMode::ON_CHANGE, m_mode);
   updateSensorReading();
 }
 
 void SensorProxy::pageVisibilityChanged() {
   if (!isInitialized())
     return;
 
   if (page()->visibilityState() != PageVisibilityStateVisible) {
     suspend();
   } else {
@@ skipping 134 matching lines @@
     updateSensorReading();
     m_timer.startRepeating(repeatInterval, BLINK_FROM_HERE);
   }
 }
 
 void SensorProxy::onTimerFired(TimerBase*) {
   updateSensorReading();
 }
 
 }  // namespace blink