[Sensors] Implement sensor data polling

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

Index: third_party/WebKit/Source/modules/sensor/Sensor.cpp
diff --git a/third_party/WebKit/Source/modules/sensor/Sensor.cpp b/third_party/WebKit/Source/modules/sensor/Sensor.cpp
index 070b3b88aa3107e7257ddbff65b4110899b8bd19..6269f7162258b4d688ab5b11d14af4e8d0f7f4ac 100644
--- a/third_party/WebKit/Source/modules/sensor/Sensor.cpp
+++ b/third_party/WebKit/Source/modules/sensor/Sensor.cpp
@@ -160,7 +160,8 @@ void Sensor::onStartRequestCompleted(bool result)
     DCHECK(m_configuration);
     DCHECK(m_sensorProxy);
     auto pollCallback = WTF::bind(&Sensor::pollForData, wrapWeakPersistent(this));
-    m_polling = SensorPollingStrategy::create(m_configuration->frequency, std::move(pollCallback), m_sensorProxy->reportingMode());
+    DCHECK_GT(m_configuration->frequency, 0);
+    m_polling = SensorPollingStrategy::create(1 / m_configuration->frequency, std::move(pollCallback), m_sensorProxy->reportingMode());
     updateState(Sensor::SensorState::ACTIVE);
 }
 
@@ -179,6 +180,15 @@ void Sensor::onStopRequestCompleted(bool result)
 void Sensor::pageVisibilityChanged()
 {
     updatePollingStatus();
+
+    if (!m_sensorProxy || !m_sensorProxy->isInitialized())
+        return;
+
+    if (page()->visibilityState() != PageVisibilityStateVisible) {
+        m_sensorProxy->suspend();
+    } else {
+        m_sensorProxy->resume();
+    }
 }
 
 void Sensor::startListening()