Auto merge of #17578 - pyfisch:input-event, r=jdm

Implement the InputEvent

Add WebIDL, from UI Events working draft.
Implement script type for event.

Note that actually firing InputEvents is not part of this commit.

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As part of my effort to improve [keyboard handling](https://groups.google.com/forum/#!topic/mozilla.dev.servo/e6R7eBDjo4M) it is necessary to introduce the InputEvent. While I have a working prototype using the input event this still needs a lot of work  before it can be merged into servo.

cc @jdm

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1 files changed, 21 insertions, 0 deletions

diff --git a/components/script/dom/webidls/InputEvent.webidl b/components/script/dom/webidls/InputEvent.webidl
new file mode 100644
index 00000000000..30e668b5e43
--- /dev/null
+++ b/components/script/dom/webidls/InputEvent.webidl
@@ -0,0 +1,21 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+/*
+ * The origin of this IDL file is
+ * https://w3c.github.io/uievents/#idl-inputevent
+ *
+ */
+
+// https://w3c.github.io/uievents/#idl-inputevent
+[Constructor(DOMString type, optional InputEventInit eventInitDict)]
+interface InputEvent : UIEvent {
+  readonly attribute DOMString? data;
+  readonly attribute boolean isComposing;
+};
+
+// https://w3c.github.io/uievents/#idl-inputeventinit
+dictionary InputEventInit : UIEventInit {
+  DOMString? data = null;
+  boolean isComposing = false;
+};