Reland "Unifies ScrollView and RenderLayer to use non-shi..."

Reland "Unifies ScrollView and RenderLayer to use non-shi..."

This patch needs to be landed at the same time as
https://chromiumcodereview.appspot.com/15006004/
Needs to update AutomationRendererHelperTest for some of the RTL tests to work.

> Unifies ScrollView and RenderLayer to use non-shifted [minPos, maxPos] scroll offset
> 
> For pages with negative overflow (due to RTL or writing mode), there are
> two sets of scroll offset defined. One that ranges from [0, maxPos - minPos]
> and the other one ranges from [minPos, maxPos]. To reduce confusion, this
> patch unifies ScrollView and RenderLayer to use the second definition of
> scroll offset.
> 
> BUG=232063
> TEST=manual
> R=jamesr@chromium.org,jchaffraix@chromium.org
> 
> Review URL: https://chromiumcodereview.appspot.com/14807003

TBR=jamesr@chromium.org,jchaffraix@chromium.org

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=150153

[commit-bot: I haz the power, 2013-05-10 23:41:09]

No comments yet.

[trchen, 2013-05-10 23:50:16]

Committed patchset #2 manually as r150153 (presubmit successful).