Get rid of extra clipping of composited layers in CompositedLayerMapping::updateCompositedBounds().

Get rid of extra clipping of composited layers in CompositedLayerMapping::updateCompositedBounds().

This was originally added in r63452 (*), as an optimization to avoid really large composited layers that
extend offscreen. This is no longer necessary, since Chrome uses a tiling architecture for all layers
(Safari, at least at the time, used a single texture for the entire layer).

(*) http://src.chromium.org/viewvc/blink?view=revision&revision=63452

BUG=

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=173030

[Ian Vollick, 2014-04-30 20:05:51]

On 2014/04/30 20:03:36, chrishtr wrote:

This is very exciting. LGTM if the bots are happy.

[chrishtr, 2014-04-30 20:14:10]

The CQ bit was checked by chrishtr@chromium.org

[commit-bot: I haz the power, 2014-04-30 20:14:32]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/chrishtr@chromium.org/266453008/20001

[commit-bot: I haz the power, 2014-04-30 21:18:44]

Change committed as 173030