https://bugs.webkit.org/show_bug.cgi?id=91756

Reviewed by Tony Chang.

Source/WebCore:

My r123067 moves the top-left origin of an RTL element right when its vertical
scrollbar is shown at its left side. (That is, r123067 moves all child objects
in the RTL element right.) This change also increases RenderBox::clientLeft()
at the same time, i.e. it also moves child objects right. Furthermore, my r109512
moves positioned objects in an RTL element right at the same time. This makes
WebKit move objects in an RTL element up to three times by the scrollbar width.
(Moving an absolute object right increases the scrollWidth value and it causes
this bug.) This change removes unnecessary code that moves objects right in my
r109512 and RenderBox::clientLeft().

Test: scrollbars/rtl/div-absolute.html
      fast/block/float/026.html
      fast/block/float/028.html
      fast/overflow/unreachable-overflow-rtl-bug.html

* dom/Element.cpp:
(WebCore::Element::clientLeft): Increase clientLeft value by the width of a vertical scrollbar as written in the CSSOM specification.
* rendering/RenderBlock.cpp:
(WebCore::RenderBlock::addOverflowFromPositionedObjects): Removed unnecessary code.
(WebCore::RenderBlock::determineLogicalLeftPositionForChild): Removed unnecessary code.
* rendering/RenderBox.h:
(WebCore::RenderBox::clientLeft): Removed unnecessary code.

LayoutTests:

This change adds a test that compares CSSOM properties of an RTL element which
includes positioned objects with the CSSOM properties of an LTR one. This change
also uses clientLeft properties in offsetX-offsetY.html to remove a hard-coded
value in the test and adds rebaselined results for Windows.

* fast/events/offsetX-offsetY.html: Replaced a hard-coded value 'borderLeft' with clientLeft.
* platform/chromium-linux/fast/block/float/026-expected.png:
* platform/chromium-linux/fast/block/float/028-expected.png:
* platform/chromium-win/fast/block/float/026-expected.png:
* platform/chromium-win/fast/block/float/028-expected.png:
* platform/chromium-win/fast/overflow/unreachable-overflow-rtl-bug-expected.png:
* platform/chromium-win/fast/overflow/unreachable-overflow-rtl-bug-expected.txt:
* scrollbars/rtl/div-absolute-expected.txt: Added.
* scrollbars/rtl/div-absolute.html: Added.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@123572 268f45cc-cd09-0410-ab3c-d52691b4dbfc