shapedetection module: Introduce basic structure for face detection

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

Index: third_party/WebKit/Source/modules/shapedetection/FaceDetector.idl
diff --git a/third_party/WebKit/Source/modules/shapedetection/FaceDetector.idl b/third_party/WebKit/Source/modules/shapedetection/FaceDetector.idl
new file mode 100644
index 0000000000000000000000000000000000000000..06a8551560332bff6c75fc193d28f48dc9d66788
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+++ b/third_party/WebKit/Source/modules/shapedetection/FaceDetector.idl
@@ -0,0 +1,13 @@
+// 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/#face-detection-api
+
+// TODO(xianglu): Add [Constructor(optional FaceDetectorOptions faceDetectorOptions)]. https://crbug.com/646083
+[
+    Constructor,
+    RuntimeEnabled=ShapeDetection,
+] interface FaceDetector {
+};
+FaceDetector implements Detector;