cc: PushProperties on viewport size change

cc: PushProperties on viewport size change

When we are using GPU rasterization, tile size is based on the viewport
width.  We could have layers that change in size, but are not invalidated
because no layout is required.  When this happens, we need to notify the
layers that they require a PushProperties to resize the tiles correctly.

Also added a test.

BUG=458750

[hendrikw, 2015-03-16 21:10:34]

hendrikw@chromium.org changed reviewers:
+ danakj@chromium.org

[hendrikw, 2015-03-16 21:10:34]

PTAL, thanks.

[hendrikw, 2015-03-16 21:50:33]

On 2015/03/16 21:10:34, hendrikw wrote:
> PTAL, thanks.

Hold off for a sec on this review please.