Adjust both x and y position when drawing glyphs

Adjust both x and y position when drawing glyphs

Change GlyphBuffer::advanceAt to return a FloatSize with both the x and
y advances. Change Font::drawGlyphBuffer to use the y advance, in
addition to the x advance, when adjusting the startPoint for drawing
glyphs.

R=dglazkov@chromium.org
BUG=247103
TEST=fast/text/international/vertical-positioning-with-combining-marks.html

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=168670

[dglazkov, 2014-03-06 18:46:00]

Wow, so proud of myself. I think I actually understand this patch. That meeting
with behdad really helped! :)

lgtm

[eae, 2014-03-06 18:46:46]

Yay!

On Thu, Mar 6, 2014 at 10:46 AM,  <dglazkov@chromium.org> wrote:
> Wow, so proud of myself. I think I actually understand this patch. That
> meeting
> with behdad really helped! :)
>
> lgtm
>
> https://codereview.chromium.org/180893004/

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[eae, 2014-03-06 19:08:26]

The CQ bit was checked by eae@chromium.org

[commit-bot: I haz the power, 2014-03-06 19:08:37]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/eae@chromium.org/180893004/40001

[commit-bot: I haz the power, 2014-03-06 19:41:06]

Change committed as 168670

[behdad, 2014-03-06 20:58:36]

lgtm

Yay!