Letting Gmail be your default mail client in Chrome is a little hipster...

Step 1: [Go to gmail.com] in Chrome and click the Protocol Handler icon overlapping-diamonds in your browser's address bar. 

Then click that little symbol, probably on the right, next to the "favorites" star, and the rest is cake.  But if you didn't know about that little symbol, well, it's much more difficult. ;^)

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