cc: Stop converting update rect from int to float to int.

cc: Stop converting update rect from int to float to int.

Layer::SetNeedsDisplay() would turn the int bounds() into a float RectF
just for PictureLayer to turn it back into an int Rect. This is silly.

If PictureLayer is just going to use ints, we might as well use ints
throughout. So convert update_rect_ from a RectF to a Rect.

R=enne
BUG=342848
Committed: https://crrev.com/19f0c9e018cc431eb60fa49615192dd091622fef
Cr-Commit-Position: refs/heads/master@{#299233}

[danakj, 2014-10-11 00:45:21]

It seems link blink has an IntRect also until GraphicsLayer, so this is still a
silly int->float->int at the WebLayer boundary, which I can fix.

[danakj, 2014-10-11 00:55:53]

Added invalidateRect(WebRect) flavours, so blink can use those. Then we can
remove the WebFloatRect ones.

[enne (OOO), 2014-10-11 01:43:26]

The CQ bit was checked by enne@chromium.org

[enne (OOO), 2014-10-11 01:43:27]

lgtm

[commit-bot: I haz the power, 2014-10-11 01:44:37]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/647253002/380001

[commit-bot: I haz the power, 2014-10-11 03:24:55]

Committed patchset #4 (id:380001)

[commit-bot: I haz the power, 2014-10-11 03:25:34]

Patchset 4 (id:??) landed as
https://crrev.com/19f0c9e018cc431eb60fa49615192dd091622fef
Cr-Commit-Position: refs/heads/master@{#299233}