[Sensors] Add an UMA histogram for Generic Sensor function calls

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 c58a10d135c7b871708566d0fdb1578d2c0b23cc..2ee4fcf8375f82d51467e1906e578f64c0cd21a0 100644
--- a/third_party/WebKit/Source/modules/sensor/Sensor.idl
+++ b/third_party/WebKit/Source/modules/sensor/Sensor.idl
@@ -20,8 +20,8 @@ enum SensorState {
     readonly attribute SensorState state;
     readonly attribute SensorReading? reading;
 
-    [CallWith=ScriptState, RaisesException] void start();
-    [CallWith=ScriptState, RaisesException] void stop();
+    [CallWith=ScriptState, RaisesException, MeasureAs = GenericSensorStart] void start();
+    [CallWith=ScriptState, RaisesException, MeasureAs = GenericSensorStop] void stop();

[Reilly Grant (use Gerrit), 2016/11/08 16:33:27]

Is there a reason for putting spaces around the equals sign for MeasureAs and
not CallWith? Other uses of MeasureAs have no spaces.

[Mikhail, 2016/11/09 08:49:13]

No specific reason, just did not switch from C++ writing :) Fixed now.

 
     attribute EventHandler onerror;
     attribute EventHandler onchange;