https://bugs.webkit.org/show_bug.cgi?id=91247

Reviewed by Antonio Gomes.
Patch by Jacky Jiang <zhajiang@rim.com>

PR: 175432
On yahoo.com, the web page stopped zooming while trying to pinch as
WebPageClient::resetBitmapZoomScale(double) was being called by
WebPagePrivate::zoomToInitialScaleOnLoad() after load finished.
And also yahoo.com was keeping updating layout, which made it really
bad that zoomToInitialScaleOnLoad() was called many times when load
finished and the load type was FrameLoadTypeStandard or FrameLoadTypeSame.
As we only care about the situation that dispatchDidFirstVisuallyNonEmptyLayout()
happens after load finished, we can move the code to that method and
set a flag for WebPage layoutFinished() and zoomToInitialScaleOnLoad()
instead. In this way, we can ensure that the flag is only enabled when
dispatchDidFirstVisuallyNonEmptyLayout() is called after load finished
and get rid of calling zoomToInitialScaleOnLoad() lots of times when
keeping updating layout in such kind of situation.

Internally reviewed by Arvid Nilsson

* Api/WebPage.cpp:
(BlackBerry::WebKit::WebPagePrivate::WebPagePrivate):
(BlackBerry::WebKit::WebPagePrivate::setLoadState):
(BlackBerry::WebKit::WebPagePrivate::layoutFinished):
* Api/WebPage_p.h:
(BlackBerry::WebKit::WebPagePrivate::shouldZoomToInitialScaleOnLoad):
(BlackBerry::WebKit::WebPagePrivate::setShouldZoomToInitialScaleAfterLoadFinished):
(WebPagePrivate):
* WebCoreSupport/FrameLoaderClientBlackBerry.cpp:
(WebCore::FrameLoaderClientBlackBerry::dispatchDidFirstVisuallyNonEmptyLayout):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@122589 268f45cc-cd09-0410-ab3c-d52691b4dbfc