Add UseCounter for WebBluetooth

third_party/WebKit/Source/modules/bluetooth/Bluetooth.cpp

Index: third_party/WebKit/Source/modules/bluetooth/Bluetooth.cpp
diff --git a/third_party/WebKit/Source/modules/bluetooth/Bluetooth.cpp b/third_party/WebKit/Source/modules/bluetooth/Bluetooth.cpp
index 1f96255ff921faffac946308105b34ca2a683cea..772092eac1503f2caeda5d5b5eef8465171114d6 100644
--- a/third_party/WebKit/Source/modules/bluetooth/Bluetooth.cpp
+++ b/third_party/WebKit/Source/modules/bluetooth/Bluetooth.cpp
@@ -9,6 +9,7 @@
 #include "bindings/core/v8/ScriptPromiseResolver.h"
 #include "core/dom/DOMException.h"
 #include "core/dom/ExceptionCode.h"
+#include "core/frame/UseCounter.h"
 #include "modules/bluetooth/BluetoothDevice.h"
 #include "modules/bluetooth/BluetoothError.h"
 #include "modules/bluetooth/BluetoothSupplement.h"
@@ -176,6 +177,7 @@ ScriptPromise Bluetooth::requestDevice(ScriptState* scriptState,
   webbluetooth->requestDevice(
       webOptions,
       new CallbackPromiseAdapter<BluetoothDevice, BluetoothError>(resolver));
+  UseCounter::count(context, UseCounter::WebBluetoothRequestDevice);

[scheib, 2016/10/28 23:20:35]

Instead of using this here, use IDL MeasureAs extended attribute:

https://chromium.googlesource.com/chromium/src/+/master/third_party/WebKit/So...

[juncai, 2016/10/28 23:49:45]

Done.

   return promise;
 }