Add usage counter to OffscreenCanvas API calls

third_party/WebKit/Source/modules/offscreencanvas2d/OffscreenCanvasRenderingContext2D.cpp

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "modules/offscreencanvas2d/OffscreenCanvasRenderingContext2D.h"
 
 #include "bindings/modules/v8/OffscreenCanvasRenderingContext2DOrWebGLRenderingContextOrWebGL2RenderingContext.h"
 #include "core/frame/ImageBitmap.h"
 #include "core/frame/Settings.h"
 #include "core/workers/WorkerGlobalScope.h"
@@ skipping 27 matching lines @@
       toWorkerGlobalScope(executionContext)->workerSettings();
   if (workerSettings && workerSettings->disableReadingFromCanvas())
     canvas->setDisableReadingFromCanvasTrue();
 }
 
 DEFINE_TRACE(OffscreenCanvasRenderingContext2D) {
   CanvasRenderingContext::trace(visitor);
   BaseRenderingContext2D::trace(visitor);
 }
 
-void OffscreenCanvasRenderingContext2D::commit(ExceptionState& exceptionState) {
+void OffscreenCanvasRenderingContext2D::commit(ScriptState* scriptState,
+                                               ExceptionState& exceptionState) {
+  UseCounter::Feature feature = UseCounter::OffscreenCanvasCommit2D;
+  UseCounter::count(scriptState->getExecutionContext(), feature);
   if (getOffscreenCanvas()->getAssociatedCanvasId() < 0) {
     // If an OffscreenCanvas has no associated canvas Id, it indicates that
     // it is not an OffscreenCanvas created by transfering control from html
     // canvas.
     exceptionState.throwDOMException(InvalidStateError,
                                      "Commit() was called on a context whose "
                                      "OffscreenCanvas is not associated with a "
                                      "canvas element.");
     return;
   }
@@ skipping 71 matching lines @@
   if (!imageBuffer())
     return nullptr;
   sk_sp<SkImage> skImage = m_imageBuffer->newSkImageSnapshot(
       PreferAcceleration, SnapshotReasonTransferToImageBitmap);
   RefPtr<StaticBitmapImage> image =
       StaticBitmapImage::create(std::move(skImage));
   image->setOriginClean(this->originClean());
   return image;
 }
 
-ImageBitmap* OffscreenCanvasRenderingContext2D::transferToImageBitmap() {
+ImageBitmap* OffscreenCanvasRenderingContext2D::transferToImageBitmap(
+    ScriptState* scriptState) {
+  UseCounter::Feature feature =
+      UseCounter::OffscreenCanvasTransferToImageBitmap2D;
+  UseCounter::count(scriptState->getExecutionContext(), feature);
   RefPtr<StaticBitmapImage> image = transferToStaticBitmapImage();
   if (!image)
     return nullptr;
   m_imageBuffer.reset();  // "Transfer" means no retained buffer
   m_needsMatrixClipRestore = true;
   return ImageBitmap::create(std::move(image));
 }
 
 PassRefPtr<Image> OffscreenCanvasRenderingContext2D::getImage(
     AccelerationHint hint,
@@ skipping 83 matching lines @@
 }
 
 bool OffscreenCanvasRenderingContext2D::isContextLost() const {
   return false;
 }
 
 bool OffscreenCanvasRenderingContext2D::isPaintable() const {
   return this->imageBuffer();
 }
 }