Emoji has become a popular feature in smartphone messaging apps like Whatsapp. The Emoji Input extension can be used to similarly pick Emoji to insert into emails and other websites in Chrome.
Just install, click its smiley face icon in the taskbar and click on any emoticon to insert it into your text field. The emoticon can also be copied to clipboard, so this extension can also act as a emoji picker on Ubuntu/Linux where no such tool is available.
Tried with: Emoji Input 2.6.4, Chrome 44.0.2403.125 (64-bit) and Ubuntu 14.04