Prevent trying to resize the buffer before the surface has been created. At
that point, we wouldn't know our maximum texture size, so we would've thrown a
RuntimeException.
This patch reinstates pinch-zooming and adds CSS re-scaling so that after
zooming, the page is rendered at the scaled resolution and you get clear text.
--HG--
rename : mobile/android/base/gfx/IntSize.java => mobile/android/base/gfx/FloatSize.java
