Add usage counter to OffscreenCanvas API calls

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 b121c409f7e114dbf44458ad417daafa1eabaf59..2224a55433e65943a3b25153e1b6b019e435d525 100644
--- a/third_party/WebKit/Source/core/frame/UseCounter.h
+++ b/third_party/WebKit/Source/core/frame/UseCounter.h
@@ -1379,6 +1379,10 @@ class CORE_EXPORT UseCounter {
     RTCConfigurationIceTransportsNone = 1655,
     RTCIceServerURL = 1656,
     RTCIceServerURLs = 1657,
+    OffscreenCanvasTransferToImageBitmap2D = 1658,
+    OffscreenCanvasTransferToImageBitmapWebGL = 1659,
+    OffscreenCanvasCommit2D = 1660,
+    OffscreenCanvasCommitWebGL = 1661,
 
     // Add new features immediately above this line. Don't change assigned
     // numbers of any item, and don't reuse removed slots.