That will make your Analytics profiles accessible within Webmaster Tools, and you will be able to access more easily the below mentioned Analytics features:
- Google Analytics Referring Pages: View your Google Analytics Referring Pages report directly from the Links to your site page in Webmaster Tools. This report helps you understand the overall trends in traffic volume from referrals, as well as the sites driving those trends.
- Google Analytics Dashboard: Access the Google Analytics Dashboard directly from the Analytics link in the top left bar when you’re on a site-related page.
How to link a verified site in Webmaster Tools to a Google Analytics profile?
There are a few steps involved,
- On the Webmaster Tools home page, click Manage next to the site you want, then click Google Analytics profile.
- Select the profile you want to associate with the site, then click Save.
Note: If your site has multiple owners, each owner will need to link their own account to a Google Analytics profile.
Reference link: http://googlewebmastercentral.blogspot.com/2011/02/linking-google-analytics-to-webmaster.html