Add simple browser extension (#109276)

* Add support for TS's Hierarchical refactorings API

microsoft/TypeScript#41975

* Add simple browser extension

This change adds a new 'simple browser' extension. This extension uses a webview to render webpages directly in VS Code. We plan on using it for optionally previewing local servers in both desktop and codespaces

The browser itself has a number of limitations due to the security around iframes:

- It traps keyboard focus
- We can't detect if a page fails to load
- We can't track the current url of the iframe

* Add experimental alert when the iframe is focused

* Disable events on focus warning

* Hooking up simple browser to opener

Author: mjbvz

Diff for: build/gulpfile.extensions.js

@@ -59,6 +59,7 @@ const compilations = [
 	'php-language-features/tsconfig.json',
 	'python/tsconfig.json',
 	'search-result/tsconfig.json',
+	'simple-browser/tsconfig.json',
 	'typescript-language-features/test-workspace/tsconfig.json',
 	'typescript-language-features/tsconfig.json',
 	'vscode-api-tests/tsconfig.json',

Diff for: build/hygiene.js

@@ -93,6 +93,7 @@ const indentationFilter = [
 	'!**/*.Dockerfile',
 	'!**/*.dockerfile',
 	'!extensions/markdown-language-features/media/*.js',
+	'!extensions/simple-browser/media/*.js',
 ];
 
 const copyrightFilter = [

Diff for: build/npm/dirs.js

@@ -34,6 +34,7 @@ exports.dirs = [
 	'extensions/npm',
 	'extensions/php-language-features',
 	'extensions/search-result',
+	'extensions/simple-browser',
 	'extensions/typescript-language-features',
 	'extensions/vscode-api-tests',
 	'extensions/vscode-colorize-tests',

Diff for: extensions/simple-browser/.vscodeignore

@@ -0,0 +1,12 @@
+test/**
+test-workspace/**
+src/**
+tsconfig.json
+out/test/**
+out/**
+extension.webpack.config.js
+extension-browser.webpack.config.js
+cgmanifest.json
+yarn.lock
+preview-src/**
+webpack.config.js

Diff for: extensions/simple-browser/README.md

@@ -0,0 +1,3 @@
+# Simple Browser files
+
+**Notice:** This extension is bundled with Visual Studio Code. It can be disabled but not uninstalled.

Diff for: extensions/simple-browser/extension-browser.webpack.config.js

@@ -0,0 +1,17 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+//@ts-check
+
+'use strict';
+
+const withBrowserDefaults = require('../shared.webpack.config').browser;
+
+module.exports = withBrowserDefaults({
+	context: __dirname,
+	entry: {
+		extension: './src/extension.ts'
+	}
+});

Diff for: extensions/simple-browser/extension.webpack.config.js

@@ -0,0 +1,20 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+//@ts-check
+
+'use strict';
+
+const withDefaults = require('../shared.webpack.config');
+
+module.exports = withDefaults({
+	context: __dirname,
+	resolve: {
+		mainFields: ['module', 'main']
+	},
+	entry: {
+		extension: './src/extension.ts',
+	}
+});