Cross compiling chromium-browser the multiarch way

Hi,

Another package that was requested to be able to cross-compiled was chromium. Now this is possible also, following the instructions at:

https://wiki.linaro.org/Platform/DevPlatform/CrossCompile/ChromiumCrossCompi...

The starting point was chromium not building on arm at all, fortunately it was quite easy to fix. While easy, it was time consuming as I had to build chrome a few times natively. With builds taking around 20h on panda. Meanwhile, on dual-core (hypertheaded, so kinda 4-core) Intel i5 M 520, cross-compile took around 1.5h. When the native builds were failing at the final linking stage, the value of cross-compiling was surely becoming clear ;)

Cheers, Riku