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Reland of place pinch scrollbars with regular scrollbars. (patchset #1 id:1 of https://codereview.chromium.org/1318603005/ )

Reason for revert:
After discussion with samuong@, the original patch should be OK to reland as is and https://codereview.chromium.org/1317153002 is an appropriate fix for the crasher.

Original issue's description:
> Revert of Replace pinch scrollbars with regular scrollbars. (patchset #10 id:180001 of https://codereview.chromium.org/1308053003/ )
> 
> Reason for revert:
> Introduced ChromeDriver devtools mobile emulation crash https://code.google.com/p/chromedriver/issues/detail?id=1205
> 
> Original issue's description:
> > Replace pinch scrollbars with regular scrollbars.
> > 
> > This patch makes the visual-viewport-managed scrollbars exclusive to
> > Android and improves normal scrollbars to be usable during pinch as follows:
> > 
> > 1. Attach the scrollbar layers to the visual viewport, so they're always
> >    onscreen as you zoom in (as already shipped on Mac).
> > 2. Set the container layer to the inner clip layer, so that the size and
> >    position of the thumb reflects the sum of the two viewports,
> >    instead of just the layout viewport.
> > 
> > Note that result of these changes is visually indistiguishable at
> > minimum page scale.  It only improves the behavior when zoomed in.
> > 
> > BUG=523056
> > 
> > Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=201285
> 
> TBR=rbyers@chromium.org,skobes@chromium.org
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=523056
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=201333

TBR=rbyers@chromium.org,skobes@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=523056

Review URL: https://codereview.chromium.org/1305223004

git-svn-id: svn://svn.chromium.org/blink/trunk@201337 bbb929c8-8fbe-4397-9dbb-9b2b20218538