feat(Launcher): introduce appMode option

The patch introduces a new appMode option to the launcher. This is an experimental
option, thus we don't document it.

lib/Browser.js

@@ -21,12 +21,13 @@ const EventEmitter = require('events');
 class Browser extends EventEmitter {
   /**
    * @param {!Connection} connection
-   * @param {boolean} ignoreHTTPSErrors
+   * @param {!Object=} options
    * @param {function():Promise=} closeCallback
    */
-  constructor(connection, ignoreHTTPSErrors, closeCallback) {
+  constructor(connection, options = {}, closeCallback) {
     super();
-    this._ignoreHTTPSErrors = ignoreHTTPSErrors;
+    this._ignoreHTTPSErrors = !!options.ignoreHTTPSErrors;
+    this._appMode = !!options.appMode;
     this._screenshotTaskQueue = new TaskQueue();
     this._connection = connection;
     this._closeCallback = closeCallback || new Function();
@@ -45,7 +46,7 @@ class Browser extends EventEmitter {
   async newPage() {
     const {targetId} = await this._connection.send('Target.createTarget', {url: 'about:blank'});
     const client = await this._connection.createSession(targetId);
-    return await Page.create(client, this._ignoreHTTPSErrors, this._screenshotTaskQueue);
+    return await Page.create(client, this._ignoreHTTPSErrors, this._appMode, this._screenshotTaskQueue);
   }
 
   /**

lib/Launcher.js

@@ -40,13 +40,15 @@ const DEFAULT_ARGS = [
   '--disable-prompt-on-repost',
   '--disable-sync',
   '--disable-translate',
-  '--enable-automation',
-  '--enable-devtools-experiments',
   '--metrics-recording-only',
   '--no-first-run',
-  '--password-store=basic',
   '--remote-debugging-port=0',
   '--safebrowsing-disable-auto-update',
+];
+
+const AUTOMATION_ARGS = [
+  '--enable-automation',
+  '--password-store=basic',
   '--use-mock-keychain',
 ];
 
@@ -56,9 +58,14 @@ class Launcher {
    * @return {!Promise<!Browser>}
    */
   static async launch(options) {
-    options = options || {};
+    options = Object.assign({}, options || {});
     let temporaryUserDataDir = null;
     const chromeArguments = [].concat(DEFAULT_ARGS);
+    if (options.appMode)
+      options.headless = false;
+    else
+      chromeArguments.push(...AUTOMATION_ARGS);
+
     if (!options.args || !options.args.some(arg => arg.startsWith('--user-data-dir'))) {
       if (!options.userDataDir)
         temporaryUserDataDir = fs.mkdtempSync(CHROME_PROFILE_PATH);
@@ -105,7 +112,7 @@ class Launcher {
       const connectionDelay = options.slowMo || 0;
       const browserWSEndpoint = await waitForWSEndpoint(chromeProcess, options.timeout || 30 * 1000);
       const connection = await Connection.create(browserWSEndpoint, connectionDelay);
-      return new Browser(connection, !!options.ignoreHTTPSErrors, killChrome);
+      return new Browser(connection, options, killChrome);
     } catch (e) {
       killChrome();
       throw e;
@@ -150,12 +157,12 @@ class Launcher {
   }
 
   /**
-   * @param {string} options
+   * @param {!Object=} options
    * @return {!Promise<!Browser>}
    */
-  static async connect({browserWSEndpoint, ignoreHTTPSErrors = false}) {
-    const connection = await Connection.create(browserWSEndpoint);
-    return new Browser(connection, !!ignoreHTTPSErrors);
+  static async connect(options = {}) {
+    const connection = await Connection.create(options.browserWSEndpoint);
+    return new Browser(connection, options);
   }
 }
 

lib/Page.js

@@ -31,10 +31,11 @@ class Page extends EventEmitter {
    * @param {!Session} client
    * @param {string} sessionId
    * @param {boolean} ignoreHTTPSErrors
+   * @param {boolean} appMode
    * @param {!TaskQueue} screenshotTaskQueue
    * @return {!Promise<!Page>}
    */
-  static async create(client, ignoreHTTPSErrors, screenshotTaskQueue) {
+  static async create(client, ignoreHTTPSErrors, appMode, screenshotTaskQueue) {
     await Promise.all([
       client.send('Network.enable', {}),
       client.send('Page.enable', {}),
@@ -46,7 +47,8 @@ class Page extends EventEmitter {
     const page = new Page(client, ignoreHTTPSErrors, screenshotTaskQueue);
     await page.goto('about:blank');
     // Initialize default page size.
-    await page.setViewport({width: 800, height: 600});
+    if (!appMode)
+      await page.setViewport({width: 800, height: 600});
     return page;
   }