The 2010 change was only for gmail. Search was 2011 [1] and other changes were post-2013. I was there at the time, and there was a huge internal reprioritization in response to the Snowden news, especially for internal traffic.

Related: https://www.jefftk.com/p/history-of-https-usage

[1] https://googleblog.blogspot.com/2011/10/making-search-more-s...