When using Dynamics CRM Online on IE11 and Google Chrome(latest version),
if you open Report viewer, you can see 'Print' button on IE.
However, on Google Chrome 'Print' button does not display.

According to the article below, 'Print‘ button only works on IE because it requires ActiveX.

Reference:
Title: Web application requirements for Microsoft Dynamics CRM ("Printing reports" section)
URL: http://technet.microsoft.com/en-us/library/hh699710.aspx#BKMK_PrintRepots

Quote:
'The Reporting Services Microsoft ActiveX control is required to print reports.'

So, it would be really nice for other WEB browsers which does not require ActiveX such as Google Chrome, can also be able to use 'Print' button.