Adds KeyEvent::properties

ui/events/mojo/event.mojom

 // Copyright 2014 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.
 
 module ui.mojom;
 
 import "ui/events/mojo/event_constants.mojom";
 import "ui/events/mojo/keyboard_codes.mojom";
 import "ui/events/mojo/latency_info.mojom";
 
@@ skipping 27 matching lines @@
   // in the medium to long term.
   int32 native_key_code;
 
   // The text generated by this keystroke. Corresponds to
   // blink::WebKeyboardEvent::text.
   uint16 text;
 
   // Like |text|, but unmodified by concurrently held modifier keys (except
   // shift). Corresponds to blink::WebKeyboardEvent::unmodifiedText.
   uint16 unmodified_text;
+
+  // Mirrors KeyEvent::properties_.
+  map<string, array<uint8>>? properties;
 };
 
 struct LocationData {
   // |x| and |y| are in the coordinate system of the View.
   // Typically, this will be an integer-valued translation w.r.t.
   // the screen and in this case, |x| and |y| are in units of physical
   // pixels. However, some View embedders may apply arbitrary transformations
   // of a view w.r.t. the screen.
   float x;
   float y;
@@ skipping 55 matching lines @@
   // TODO(sky): parts of this should move to PointerData.
   int32 flags;
   // Time in microseconds from when the platform was started.
   // This value accurately orders events w.r.t. to each other but
   // does not position them at an absolute time.
   int64 time_stamp;
   LatencyInfo latency;
   KeyData? key_data;
   PointerData? pointer_data;
 };