Google Viewer renderer showing "No preview available"

Problem/Motivation

While choosing "Google Viewer" renderer for the PDF embed shows "No preview available" on all screens/devices.

Steps to reproduce

1. Install the module
2. Create a file field
3. Go to Manage display, and for the File field, choose the format as "PDF Reader"
4. Click on settings, select "Google Viewer", and submit the form
5. Upload the PDF to the file field in your content
6. Open the content on the desktop/mobile, etc, and the embed will load and show "No preview available"

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes