On Android, if the user opens either an android protocol link (e.g. market://), the link will be automatically opened in the app that is registered to handle those links.

Similarly, if an app registers as the handler for certain domains (e.g. facebook.com), those will also result in opening the app instead of opening within Chrome (although the user may be prompted to choose how the link should be handled).

We should track these navigation events within Tab sync, for the purpose of letting users better understand their navigation history. Currently, because these navigation events don't trigger WebContents navigations, we don't record them at all.