FrameView's size should be calculated based on contentWidth+scrollbarWidth

FrameView's size should be calculated based on contentWidth+scrollbarWidth

In virtual viewport mode, the main FrameView's size is calculated based on
the content width of the page. On platforms where scrollbars take up layout
space (non-overlay scrollbars), this should include the scrollbar width as
well as the content width since the PinchViewport encompasses both when
fully zoomed out and the PinchViewport is bounded by the outer viewport.

BUG=148816
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=184682

[bokan, 2014-10-30 16:59:18]

bokan@chromium.org changed reviewers:
+ aelias@chromium.org

[bokan, 2014-10-30 16:59:18]

This was causing problems in layout tests. I think it's more correct in general
but didn't cause a problem because we set the frame size using the aspect ratio
on CrOS due to having a minimum page scale. In layout tests the page scale
limits weren't being set (fixed in a different patch) so we took the first if
block through mainFrameSize()

[aelias_OOO_until_Jul13, 2014-10-30 20:52:16]

lgtm

[bokan, 2014-10-30 21:11:08]

The CQ bit was checked by bokan@chromium.org

[commit-bot: I haz the power, 2014-10-30 21:11:58]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/686293003/1

[commit-bot: I haz the power, 2014-10-31 01:20:59]

Committed patchset #1 (id:1) as 184682