More broadly, that was also the time Microsoft was going after Android OEMs - never Google directly - threatening them with a secret list of patents that Android allegedly infringed[1]. The settlement almost always resulted in the OEM agreeing to manufacture Windows phones (HTC and Samsung, off the top of my head). As an outsider, it appeared to be part of a mobile marketshare shadow war.
1. I'm guessing to prevent invalidation or work-arounds.