base

Hack to fix issue #2125365: Sports Trivia compatability with Eclair

Adds a mechanism to tell Paint the scaling factor its target
canvas will have, for it to compute font metrics based on the
correct font size.  Only TextView uses this, but that is enough
for the large majority of apps.

Change-Id: I6cacaa0dd26d40ee3ad959bed0028678d6e9016e