shapedetection module: Introduce basic structure for face detection

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

Index: third_party/WebKit/Source/modules/shapedetection/DetectedFace.idl
diff --git a/third_party/WebKit/Source/modules/shapedetection/DetectedFace.idl b/third_party/WebKit/Source/modules/shapedetection/DetectedFace.idl
new file mode 100644
index 0000000000000000000000000000000000000000..8e1a0da252ac27544bb2e5e8233d6e065c4dceeb
--- /dev/null
+++ b/third_party/WebKit/Source/modules/shapedetection/DetectedFace.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
+
+[
+    Constructor,
+    RuntimeEnabled=ShapeDetection,
+] interface DetectedFace {
+// TODO(xianglu): Implement missing fields. https://crbug.com/646083
+};
+DetectedFace implements DetectedObject;