Add externs for Ink API

PiperOrigin-RevId: 501366896

Author: Closure Team

externs/browser/wicg_ink.js

@@ -0,0 +1,89 @@
+/*
+ * Copyright 2022 The Closure Compiler Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @fileoverview The current draft spec of Ink API.
+ * @see https://wicg.github.io/ink-enhancement/
+ * @externs
+ */
+
+/**
+ * @see https://wicg.github.io/ink-enhancement/#ink-presenter-param
+ * @record
+ * @struct
+ */
+function InkPresenterParam() {}
+
+/** @type {?Element} */
+InkPresenterParam.prototype.presentationArea;
+
+/**
+ * The Ink API provides the InkPresenter interface to expose the underlying
+ * operating system API to achieve this and keeps the extensibility open in
+ * order to support additional presenters in the future.
+ * @see https://wicg.github.io/ink-enhancement/#ink-interface
+ * @interface
+ * @struct
+ */
+function Ink() {}
+
+/**
+ * @param {?InkPresenterParam=} param
+ * @return {!Promise<!InkPresenter>}
+ */
+Ink.prototype.requestPresenter = function(param) {};
+
+
+/**
+ * @see https://wicg.github.io/ink-enhancement/#ink-presenter
+ * @interface
+ * @struct
+ */
+function InkPresenter() {}
+
+/** @type {?Element} */
+InkPresenter.prototype.presentationArea;
+
+/** @type {number} */
+InkPresenter.prototype.expectedImprovement;
+
+/**
+ * @param {!PointerEvent} event
+ * @param {!InkTrailStyle} style
+ * @return {void}
+ */
+InkPresenter.prototype.updateInkTrailStartPoint = function(event, style) {};
+
+
+/**
+ * @see https://wicg.github.io/ink-enhancement/#ink-trail-style
+ * @record
+ * @struct
+ */
+function InkTrailStyle() {}
+
+/** @type {string} */
+InkTrailStyle.prototype.color;
+
+/** @type {number} */
+InkTrailStyle.prototype.diameter;
+
+
+/**
+ * @see https://wicg.github.io/ink-enhancement/#navigator-interface-extensions
+ * @type {!Ink}
+ */
+Navigator.prototype.ink;