shapedetection module: Introduce basic structure for face detection

third_party/WebKit/Source/modules/shapedetection/Detector.idl

Index: third_party/WebKit/Source/modules/shapedetection/Detector.idl
diff --git a/third_party/WebKit/Source/modules/shapedetection/Detector.idl b/third_party/WebKit/Source/modules/shapedetection/Detector.idl
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index 0000000000000000000000000000000000000000..86ed9ff9fb5f62dbb21f011a66654b993e631739
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+// 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.
+
+// https://wicg.github.io/shape-detection-api/#api
+
+[
+    Exposed=(Window,Worker),
+    RuntimeEnabled=ShapeDetection,
+] interface Detector {
+    [CallWith=ScriptState]Promise<sequence<DetectedObject>> detect(HTMLImageElement htmlImageElement);
+};