https://bugs.webkit.org/show_bug.cgi?id=118175
<rdar://problem/14301217>

Reviewed by Anders Carlsson.

Test (API): WebKit2.ResizeReversePaginatedWebView

* page/FrameView.cpp:
(WebCore::FrameView::maximumScrollPosition):
* page/FrameView.h:
Override maximumScrollPosition() in FrameView and don't clamp to zero if
a reverse pagination mode is enabled, as it is possible (and common) to
have a negative maximum scroll position with reverse pagination.

* platform/ScrollView.cpp:
(WebCore::ScrollView::updateScrollbars):
Drive-by adoption of toIntSize().

* TestWebKitAPI/TestWebKitAPI.xcodeproj/project.pbxproj:
* TestWebKitAPI/Tests/WebKit2/ResizeReversePaginatedWebView.cpp: Added.
(TestWebKitAPI::didRunJavaScript):
(TestWebKitAPI::didLayout):
(TestWebKitAPI::TEST):
* TestWebKitAPI/Tests/WebKit2/lots-of-text-vertical-lr.html: Added.
Add a test that loads a vertical-lr document, paginates it horizontally
from right to left, resizes the view to fit the entire document, and
verifies that the scroll position is negative, as it must be for the
document to be enclosed by the view.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@152265 268f45cc-cd09-0410-ab3c-d52691b4dbfc