convertOpenComposeRequest_(request) {
    return /** @type {e2e.ext.messages.BridgeMessageRequest} */ ({
      selection: request.args.body,
      recipients: request.args.recipients,
      action: utils.text.getPgpAction(request.args.body),
      request: true,
      origin: this.getOrigin_(),
      subject: request.args.subject,
      canInject: true,
      canSaveDraft: true
    });
  }
Converts a WebsiteAPI request to BridgeMessageRequest.
@param  {e2e.ext.WebsiteApi.Request} request
@return {e2e.ext.messages.BridgeMessageRequest} Request
@private