Add usage counter to OffscreenCanvas API calls

third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.cpp

 /*
  * Copyright (C) 2009 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 660 matching lines @@
     const CanvasContextCreationAttributes& attributes,
     unsigned webGLVersion) {
   return createContextProviderInternal(nullptr, scriptState, attributes,
                                        webGLVersion);
 }
 
 void WebGLRenderingContextBase::forceNextWebGLContextCreationToFail() {
   shouldFailContextCreationForTesting = true;
 }
 
-ImageBitmap* WebGLRenderingContextBase::transferToImageBitmapBase() {
+ImageBitmap* WebGLRenderingContextBase::transferToImageBitmapBase(
+    ScriptState* scriptState) {
+  UseCounter::Feature feature =
+      UseCounter::OffscreenCanvasTransferToImageBitmapWebGL;
+  UseCounter::count(scriptState->getExecutionContext(), feature);
   if (!drawingBuffer())
     return nullptr;
   return ImageBitmap::create(drawingBuffer()->transferToStaticBitmapImage());
 }
 
-void WebGLRenderingContextBase::commit(ExceptionState& exceptionState) {
+void WebGLRenderingContextBase::commit(ScriptState* scriptState,
+                                       ExceptionState& exceptionState) {
+  UseCounter::Feature feature = UseCounter::OffscreenCanvasCommitWebGL;
+  UseCounter::count(scriptState->getExecutionContext(), feature);
   if (!getOffscreenCanvas()) {
     exceptionState.throwDOMException(InvalidStateError,
                                      "Commit() was called on a rendering "
                                      "context that was not created from an "
                                      "OffscreenCanvas.");
     return;
   }
   // no HTMLCanvas associated, thrown InvalidStateError
   if (getOffscreenCanvas()->getAssociatedCanvasId() == -1) {
     exceptionState.throwDOMException(InvalidStateError,
@@ skipping 6842 matching lines @@
 
 void WebGLRenderingContextBase::getHTMLOrOffscreenCanvas(
     HTMLCanvasElementOrOffscreenCanvas& result) const {
   if (canvas())
     result.setHTMLCanvasElement(canvas());
   else
     result.setOffscreenCanvas(getOffscreenCanvas());
 }
 
 }  // namespace blink