I implemented  using this link Google Authentication (https://help.salesforce.com/articleView?id=sso_provider_google.htm&type=5). I also check Test-Only Initialization URL. It is ok but did not go to  salesforce. 

Got xml from Test only initialization URL-
<user> <full_name>My Google Name</full_name> <provider>Google</provider> <org_id>my org id</org_id> .... <portal_id>000000000000000</portal_id> <locale>en-GB</locale> <email>mygmail@gmail.com</email> </user>

After login in from google folloing eror shows-

Integrate SSO in any website with salesforce.

Integrate SSO in any website with salesforce.