Measure usage of RTCSessionDescription's type and sdp attributes

third_party/WebKit/Source/core/frame/UseCounter.h

Index: third_party/WebKit/Source/core/frame/UseCounter.h
diff --git a/third_party/WebKit/Source/core/frame/UseCounter.h b/third_party/WebKit/Source/core/frame/UseCounter.h
index 258090fdcc033ffaf1ca96fef8875e3b96b69237..03e4e281db6b9e1be58ac3f8d4e3aa70368b9b6e 100644
--- a/third_party/WebKit/Source/core/frame/UseCounter.h
+++ b/third_party/WebKit/Source/core/frame/UseCounter.h
@@ -1387,6 +1387,12 @@ class CORE_EXPORT UseCounter {
     WebBluetoothRequestDevice = 1670,
     UnitlessPerspectiveInPerspectiveProperty = 1671,
     UnitlessPerspectiveInTransformProperty = 1672,
+    V8RTCSessionDescription_Type_AttributeGetter = 1673,
+    V8RTCSessionDescription_Type_AttributeSetter = 1674,
+    V8RTCSessionDescription_Sdp_AttributeGetter = 1675,
+    V8RTCSessionDescription_Sdp_AttributeSetter = 1676,
+    RTCSessionDescriptionInitNoType = 1677,
+    RTCSessionDescriptionInitNoSdp = 1678,
 
     // Add new features immediately above this line. Don't change assigned
     // numbers of any item, and don't reuse removed slots.