feat(Page): introduce Page.setBypassCSP (#2324)

This patch introduces `page.setBypassCSP` method that allows clients
to ignore Content-Security-Policy for a given page.

Fixes #1229.

lib/Page.js

@@ -610,6 +610,13 @@ class Page extends EventEmitter {
     await this._client.send('Emulation.setScriptExecutionDisabled', { value: !enabled });
   }
 
+  /**
+   * @param {boolean} enabled
+   */
+  async setBypassCSP(enabled) {
+    await this._client.send('Page.setBypassCSP', { enabled });
+  }
+
   /**
    * @param {?string} mediaType
    */