ShapeDetection: implement barcode detection, blink part

third_party/WebKit/Source/modules/shapedetection/BarcodeDetector.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/shapedetection/BarcodeDetector.h"
+
+#include "core/dom/DOMException.h"
+#include "core/frame/LocalDOMWindow.h"
+#include "core/frame/LocalFrame.h"
+#include "core/html/canvas/CanvasImageSource.h"
+
+namespace blink {
+
+BarcodeDetector* BarcodeDetector::create(ScriptState* scriptState) {
+  return new BarcodeDetector(*scriptState->domWindow()->frame());
+}
+
+BarcodeDetector::BarcodeDetector(LocalFrame& frame) : ShapeDetector(frame) {}
+
+ScriptPromise BarcodeDetector::detect(
+    ScriptState* scriptState,
+    const CanvasImageSourceUnion& imageSource) {
+  return detectShapes(scriptState, ShapeDetector::DetectorType::Barcode,
+                      imageSource);
+}
+
+DEFINE_TRACE(BarcodeDetector) {
+  ShapeDetector::trace(visitor);
+}
+
+}  // namespace blink