A brief Googling didn't make it clear to me whether Android has the option to set global text size or, if it does, whether it matches Apple's scheme sufficiently well that it'd make sense to have a common specification for this.
That's a lot like saying that after searching the Usenet, you didn't find that IE supported the <blink> tag, while Netscape did :)
Android should let you set system font sizes. It's a usability thing. And if Apple, Google, and MS can agree on how this is done, that'd be a good thing for everyone involved.