Add @webref/idl dependency

Signed-off-by: Victor Porof <victorporof@chromium.org>
Bug: 1325812
Change-Id: I044170880d20ce0402062755787cccafd63c6a42
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/3695370
Reviewed-by: Mathias Bynens <mathias@chromium.org>
diff --git a/node_modules/@webref/idl/css-transitions.idl b/node_modules/@webref/idl/css-transitions.idl
new file mode 100644
index 0000000..174bf209
--- /dev/null
+++ b/node_modules/@webref/idl/css-transitions.idl
@@ -0,0 +1,25 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: CSS Transitions (https://drafts.csswg.org/css-transitions/)
+
+[Exposed=Window]
+interface TransitionEvent : Event {
+  constructor(CSSOMString type, optional TransitionEventInit transitionEventInitDict = {});
+  readonly attribute CSSOMString propertyName;
+  readonly attribute double elapsedTime;
+  readonly attribute CSSOMString pseudoElement;
+};
+
+dictionary TransitionEventInit : EventInit {
+  CSSOMString propertyName = "";
+  double elapsedTime = 0.0;
+  CSSOMString pseudoElement = "";
+};
+
+partial interface mixin GlobalEventHandlers {
+  attribute EventHandler ontransitionrun;
+  attribute EventHandler ontransitionstart;
+  attribute EventHandler ontransitionend;
+  attribute EventHandler ontransitioncancel;
+};