Added web-exposed constructor for Touch and TouchEvent

third_party/WebKit/Source/core/events/TouchEventInit.idl

Index: third_party/WebKit/Source/core/events/TouchEventInit.idl
diff --git a/third_party/WebKit/Source/core/events/TouchEventInit.idl b/third_party/WebKit/Source/core/events/TouchEventInit.idl
new file mode 100644
index 0000000000000000000000000000000000000000..3fffb6b8955015c1f103865d98cb91de7239c769
--- /dev/null
+++ b/third_party/WebKit/Source/core/events/TouchEventInit.idl
@@ -0,0 +1,11 @@
+// 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/#touchevent-interface
+
+dictionary TouchEventInit : EventModifierInit {
+    sequence<Touch> touches = [];
+    sequence<Touch> targetTouches = [];
+    sequence<Touch> changedTouches = [];
+};