ui/gfx: Change Canvas::ScaleInt() to just Canvas::Scale().

ui/gfx: Change Canvas::ScaleInt() to just Canvas::Scale().

BUG=100898
R=pkasting@chromium.org

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=107559

[Peter Kasting, 2011-10-27 00:42:29]

I don't think we should change this to take a Point, because the arguments
really represent scaling factors on each dimension instead of a coordinate.

I would be OK with changing the signature to Scale(int x_scale, int y_scale).

[tfarina, 2011-10-27 00:48:59]

On 2011/10/27 00:42:29, Peter Kasting wrote:
> I don't think we should change this to take a Point, because the arguments
> really represent scaling factors on each dimension instead of a coordinate.
> 
> I would be OK with changing the signature to Scale(int x_scale, int y_scale).

Done.

[Peter Kasting, 2011-10-27 00:53:03]

LGTM

It's interesting to me that outside of a test, we only ever Scale(-1, 1). 
Perhaps we should consider replacing the Scale() function with some sort of a
"mirror" call that just does this.  Dunno if that's actually a good idea.