GREAT NEWS! It seems, Microsoft is planning to add the support for Web Resource and IFrame on CRM for tablets. Although this is a Preview Feature only, but, it will be great addition.
To test this,
1. Go to System Settings
2. Go to Customization tab
3. Check Enable Web resource and IFRAME for CRM for tablets
Link – http://www.microsoft.com/en-US/dynamics/crm-customer-center/preview-feature-iframe-and-web-resource-support-in-crm-for-tablets.aspx