I thought it's only 40-50% of Android apps are pure-Dalvik, guess from the number of applications available on GoogleTV (which is around 1/3-1/4 of app available for Android). Technically GoogleTV runs Android apps with some restriction (ie. no portrait layout, no native code, no touchscreen-required, in the manifest).

NDK is the most popular request in the GoogleTV bug tracker nowaday.

Problem is most people try to use the same code across the platforms. Android run dalvik with native code (C/C++), iOS uses native code based on Obj-C but C/C++ could be used, WP8 also uses native code.

Actually I think Chrome is native app, WebKit is native, V8 is also native. Chrome on Android shared the same code with Desktop versions (Windows, OSX, Linux).

Well I guess, they don't tested Chrome on x86 Android just yet. x86 native is a supported platform already, so I don't think this problem would last long. Remember the phone is not released yet though.

FYI: Chrome is also available on GoogleTV despite it's based on Android 3.2. I thought somehow it runs on the old GoogleTV devices that use x86 Atom processor, though I don't have these devices to try.