From the Google Scholar Blog:
Today, we are adding a Public access section to Scholar profiles to help you track and manage public access mandates for your articles. If your public Scholar profile has papers covered by public access mandates from research funding agencies, you should see a new section that looks like this:
Many funding agencies have added public access mandates to promote broad access to funded research. This helps researchers everywhere build on what their colleagues have discovered. You can browse a list of public access mandates from funding agencies worldwide and view summary statistics for each agency that include the level of public availability of mandated articles overall and over several recent years.