Call FrameView::contentsResized() when setting fixed layout size
https://bugs.webkit.org/show_bug.cgi?id=107922

Reviewed by James Robinson.

In fixed layout mode, we should be calling contentsResized() when the
fixed layout size is changed; on the other hand, we don't need to layout
when the visible contents size changes.

This fixes test WebFrameTest::FixedLayoutInitializeAtMinimumPageScale.

Source/WebCore:

* page/FrameView.cpp:
(WebCore::FrameView::visibleContentsResized):
* platform/ScrollView.cpp:
(WebCore::ScrollView::setFixedLayoutSize):
(WebCore::ScrollView::setUseFixedLayout):

Source/WebKit/chromium:

* src/WebViewImpl.cpp:
(WebKit::WebViewImpl::resize):
(WebKit::WebViewImpl::computePageScaleFactorLimits):
* tests/WebFrameTest.cpp:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@140869 268f45cc-cd09-0410-ab3c-d52691b4dbfc