Typically, when Google shows a PDF document in the Google search results, you see a link to “view as HTML,” in the snippet. Here is a picture of what you see most of the time:
Now, it appears Google is showing a link that reads just “View” and links you to the PDF within a Google Docs view. Please note that this happens on some PDFs and not all. Here is a picture of that:
When you click on “View” it takes you to Google Docs. For example, for the search [triangle heights concurrency] you can see the View link and when you click on it, you are taken here, to Google Docs.
Hat tip to Google Operating System for spotting this.