Why isn’t Chrome a part of Android

Android (Finally) Taking Steps Towards WebKit And Chromium 

Why isn’t Chrome a part of Android? It’s a question as old as time itself. Or at least a few years old. But given that the same company, Google, makes both products, it never made much sense. Now they’re finally taking steps to resolve this. A bit. Maybe.
As a group of Googlers have announced on the WebKit-Dev group today (relayed by Google’s Peter Beverloo), the Android team is now committed to working more closely with the WebKit community. Yes, it’s a bit odd that a product so devoted to “open” wasn’t really working with the open source community before — but hey, better late than never.The full story is a bit more complicated than it appears on the surface. While Android has its own separate browser which isn’t branded as “Chrome”, the two do share some code. But they’re not the same, and two separate teams work on each. For whatever reason, Google chose not to brand the Android browser as Chrome, and doing so now may cause some confusion since there’s Chrome OS — another operating system built by Google that’s unrelated to Android.