[Sensors] Implementation of the Generic Sensor API

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

Index: third_party/WebKit/Source/modules/sensor/SensorReading.cpp
diff --git a/third_party/WebKit/Source/modules/sensor/SensorReading.cpp b/third_party/WebKit/Source/modules/sensor/SensorReading.cpp
index 9eb63d020623789918c2b59697b9332bb8155687..12c14881bc9af7be3a74f93e364ea500abd8c641 100644
--- a/third_party/WebKit/Source/modules/sensor/SensorReading.cpp
+++ b/third_party/WebKit/Source/modules/sensor/SensorReading.cpp
@@ -4,33 +4,34 @@
 
 #include "modules/sensor/SensorReading.h"
 
+#include "core/dom/ExecutionContext.h"
+#include "core/frame/LocalDOMWindow.h"
+#include "core/timing/DOMWindowPerformance.h"
+#include "core/timing/Performance.h"
+
 namespace blink {
 
-SensorReading::SensorReading()
+SensorReading::SensorReading(SensorProxy* sensorProxy)
+    : m_sensorProxy(sensorProxy)
 {
+    DCHECK(m_sensorProxy);
 }
 
-SensorReading::SensorReading(bool providesTimeStamp, DOMHighResTimeStamp timeStamp)
-    : m_canProvideTimeStamp(providesTimeStamp)
-    , m_timeStamp(timeStamp)
+DEFINE_TRACE(SensorReading)
 {
+    visitor->trace(m_sensorProxy);
 }
 
-DOMHighResTimeStamp SensorReading::timeStamp(bool& isNull)
+DOMHighResTimeStamp SensorReading::timeStamp(ScriptState* scriptState) const
 {
-    if (m_canProvideTimeStamp)
-        return m_timeStamp;
-
-    isNull = true;
-    return 0;
-}
+    LocalDOMWindow* window = scriptState->domWindow();
+    if (!window)
+        return 0.0;
 
-SensorReading::~SensorReading()
-{
-}
+    Performance* performance = DOMWindowPerformance::performance(*window);
+    DCHECK(performance);
 
-DEFINE_TRACE(SensorReading)
-{
+    return performance->monotonicTimeToDOMHighResTimeStamp(m_sensorProxy->reading().timestamp);
 }
 
 } // namespace blink