[SVG] Handle beginEvent for svg animations

[SVG] Handle beginEvent for svg animations

Handled beginEvent for svg animations according to http://www.w3.org/TR/SMIL3/smil-timing.html#q135

R=pdr@chromium.org, schenney@chromium.org, dschulze@chromium.org, fmalita@chromium.org
BUG=269642
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=157026

[pavane, 2013-08-08 19:11:09]

WIP patch, Please have a look.

Facing problem with writing layout tests, please help.

I triggered a discussion at https://codereview.chromium.org/22604002/

[pavane, 2013-08-30 20:47:41]

Please have a look at this patch

[pdr., 2013-08-30 20:50:18]

LGTM with nits.

Feel free to land this once you update the test.

https://codereview.chromium.org/22706003/diff/6001/LayoutTests/svg/animations...
File LayoutTests/svg/animations/begin-event.svg (right):

https://codereview.chromium.org/22706003/diff/6001/LayoutTests/svg/animations...
LayoutTests/svg/animations/begin-event.svg:5: <animate id="anim"
attributeName="visibility" to="visible" begin="0s" end="2s" fill="freeze"/>
We like to try to have tests end with a green square. Can you change this to
animate the width from 0 to 100 instead of 100 to 500?

[commit-bot: I haz the power, 2013-08-30 21:00:52]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/pavan.e@samsung.com/22706003/12001

[commit-bot: I haz the power, 2013-08-30 23:17:47]

Change committed as 157026