[Sensors] Adding more UMA histogram values

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

Index: third_party/WebKit/Source/modules/sensor/Sensor.idl
diff --git a/third_party/WebKit/Source/modules/sensor/Sensor.idl b/third_party/WebKit/Source/modules/sensor/Sensor.idl
index daf1e537a99501a0e55cfc94b01f7ae7edbff8cc..45f02c4944cf3416fee2fdbabeb221aa9a309473 100644
--- a/third_party/WebKit/Source/modules/sensor/Sensor.idl
+++ b/third_party/WebKit/Source/modules/sensor/Sensor.idl
@@ -18,13 +18,13 @@ enum SensorState {
     DependentLifetime,
     RuntimeEnabled=Sensor,
 ] interface Sensor : EventTarget {
-    readonly attribute SensorState state;
+    [MeasureAs=GenericSensorState] readonly attribute SensorState state;
     [CallWith=ScriptState] readonly attribute DOMHighResTimeStamp? timestamp;
 
     [MeasureAs=GenericSensorStart] void start();
     [MeasureAs=GenericSensorStop] void stop();
 
-    attribute EventHandler onerror;
-    attribute EventHandler onchange;
-    attribute EventHandler onactivate;
+    [MeasureAs=GenericSensorOnError] attribute EventHandler onerror;
+    [MeasureAs=GenericSensorOnChange] attribute EventHandler onchange;
+    [MeasureAs=GenericSensorOnActivate] attribute EventHandler onactivate;
 };