Added web-exposed constructor for Touch and TouchEvent

third_party/WebKit/Source/core/dom/TouchInit.idl

+// Copyright 2015 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://w3c.github.io/touch-events/#touch-interface
+
+[
+    RuntimeEnabled=Touch,

[Rick Byers, 2015/11/10 06:31:51]

also no reason to be RuntimeEnabled.
See https://code.google.com/p/chromium/issues/detail?id=392584 for some
background here.

+] dictionary TouchInit {
+    required long        identifier;
+    required EventTarget target;
+             double      clientX = 0;
+             double      clientY = 0;
+             double      screenX = 0;
+             double      screenY = 0;
+             double      pageX = 0;
+             double      pageY = 0;
+             float       radiusX = 0;
+             float       radiusY = 0;
+             float       rotationAngle = 0;
+             float       force = 0;
+};