feat: add proxy and bypass list parameters to createIncognitoBrowserC…

…ontext

Issue: puppeteer#678

Example:

const browser = await puppeteer.launch();
const context = await browser.createIncognitoBrowserContext('myproxy.com:3128');
const page = await context.newPage()
await page.authenticate({username: 'foo', password: 'bar' });
await page.goto('https://google.com');
await browser.close();

docs/api.md

@@ -887,6 +887,8 @@ During the process of closing the browser, Puppeteer attempts to delete the temp
 
 #### browser.createIncognitoBrowserContext()
 
+- `proxyServer` <[string]> Proxy server with optional port to use for all requests. username and password can be set in ['page.authenticate'].
+- `proxyBypassList` <[string]> Bypass the proxy for the given semi-colon-separated list of hosts.
 - returns: <[Promise]<[BrowserContext]>>
 
 Creates a new incognito browser context. This won't share cookies/cache with other browser contexts.

src/common/Browser.ts

@@ -293,9 +293,16 @@ export class Browser extends EventEmitter {
    * })();
    * ```
    */
-  async createIncognitoBrowserContext(): Promise<BrowserContext> {
+  async createIncognitoBrowserContext(
+    server?: string,
+    bypassList?: string
+  ): Promise<BrowserContext> {
     const { browserContextId } = await this._connection.send(
-      'Target.createBrowserContext'
+      'Target.createBrowserContext',
+      {
+        proxyServer: server || undefined,
+        proxyBypassList: bypassList || undefined,
+      }
     );
     const context = new BrowserContext(
       this._connection,