https://bugs.webkit.org/show_bug.cgi?id=82949

Patch by Alexandre Elias <aelias@google.com> on 2012-05-22
Reviewed by Adam Barth.

First, check that isPageScaleFactorSet return false before setting
initial-scale. We need to call dispatchViewportPropertiesDidChange()
when the viewport width changes, since that's an input to the viewport
tag calculation. When this happens, we shouldn't pop back to initial
scale.

Second, check that isNewNavigation is true when deciding to clear
isPageScaleFactorIsSet in didCommitLoad. We only want to clear it on
the very first commit, otherwise we'll pop back to initial scale if
the user zooms in before the load is complete.

New test WebFrameTest::FixedLayoutInitializeAtMinimumPageScale.

* src/ChromeClientImpl.cpp:
(WebKit::ChromeClientImpl::dispatchViewportPropertiesDidChange):
* src/WebViewImpl.cpp:
(WebKit::WebViewImpl::didCommitLoad):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@118121 268f45cc-cd09-0410-ab3c-d52691b4dbfc