Cleaned up some of the code
Fixed alignment... I might have missed something...

The function rowBytes is supposed to return a Sk64 object. On which it
does a shiftLeft(1) and it returns a 32bit get32()... Techincally it
does a shift of 1 like width << 1;. But this doesn't work.

https://github.com/mozilla-services/services-central-legacy/blob/master/gfx/skia/src/core/Sk64.cpp#L38

Since each row in our images are 4 bytes encoded RGBA8888 we can
hardcode rowBytes to multiply by 4 the width of the image.