Reviewed by Antti Koivisto.

Refactoring of frameset flattening code to reuse it for
iframe flattening.

Tests: fast/frames/flattening/iframe-flattening-simple.html

* WebCore.base.exp:
* page/FrameView.cpp:
(WebCore::FrameView::layout):
(WebCore::FrameView::scheduleRelayout):
* page/Settings.cpp:
(WebCore::Settings::Settings):
(WebCore::Settings::setFrameFlatteningEnabled):
* page/Settings.h:
(WebCore::Settings::frameFlatteningEnabled):
* rendering/RenderFrame.cpp:
* rendering/RenderFrame.h:
* rendering/RenderFrameSet.cpp:
(WebCore::RenderFrameSet::flattenFrameSet):
* rendering/RenderFrameSet.h:
* rendering/RenderPart.cpp:
(WebCore::RenderPart::layoutWithFlattening):
* rendering/RenderPart.h:
* rendering/RenderPartObject.cpp:
(WebCore::RenderPartObject::flattenFrame):
(WebCore::RenderPartObject::calcHeight):
(WebCore::RenderPartObject::calcWidth):
(WebCore::RenderPartObject::layout):
* rendering/RenderPartObject.h:

WebKit/mac: Change method name due to it dealing with both flattening
of frame sets and inner frames.

Reviewed by Antti Koivisto.

* WebView/WebPreferenceKeysPrivate.h:
* WebView/WebPreferences.mm:
(+[WebPreferences initialize]):
(-[WebPreferences isFrameFlatteningEnabled]):
(-[WebPreferences setFrameFlatteningEnabled:]):
* WebView/WebPreferencesPrivate.h:
* WebView/WebView.mm:
(-[WebView _preferencesChangedNotification:]):

WebKit/qt: Change due to renaming of frame flattening setting.

Reviewed by Antti Koivisto.

* Api/qwebpage.cpp:
(qt_drt_setFrameFlatteningEnabled):
* Api/qwebsettings.cpp:
(QWebSettingsPrivate::apply):
* symbian/eabi/QtWebKitu.def:

WebKit/win: Change method name due to it dealing with both flattening
of frame sets and inner frames.

Reviewed by Antti Koivisto.

* Interfaces/IWebPreferencesPrivate.idl:
* WebPreferenceKeysPrivate.h:
* WebPreferences.cpp:
(WebPreferences::initializeDefaultSettings):
(WebPreferences::isFrameFlatteningEnabled):
(WebPreferences::setFrameFlatteningEnabled):
* WebPreferences.h:
* WebView.cpp:
(WebView::notifyPreferencesChanged):

WebKitTools: Renaming of frame flattening LayoutTestController method
to setFrameFlatteningEnabled(bool)

Reviewed by Antti Koivisto.

* DumpRenderTree/LayoutTestController.cpp:
(setFrameFlatteningEnabledCallback):
(LayoutTestController::staticFunctions):
* DumpRenderTree/LayoutTestController.h:
* DumpRenderTree/gtk/LayoutTestControllerGtk.cpp:
(LayoutTestController::setFrameFlatteningEnabled):
* DumpRenderTree/mac/DumpRenderTree.mm:
(resetDefaultsToConsistentValues):
* DumpRenderTree/mac/LayoutTestControllerMac.mm:
(LayoutTestController::setFrameFlatteningEnabled):
* DumpRenderTree/qt/DumpRenderTreeQt.cpp:
(WebCore::WebPage::resetSettings):
* DumpRenderTree/qt/LayoutTestControllerQt.cpp:
(LayoutTestController::setFrameFlatteningEnabled):
* DumpRenderTree/qt/LayoutTestControllerQt.h:
* DumpRenderTree/win/DumpRenderTree.cpp:
(resetDefaultsToConsistentValues):
* DumpRenderTree/win/LayoutTestControllerWin.cpp:
(LayoutTestController::setFrameFlatteningEnabled):
* DumpRenderTree/wx/LayoutTestControllerWx.cpp:
(LayoutTestController::setFrameFlatteningEnabled):

LayoutTests: Add new iframe flattening test and change existing frameset
flattening tests to use the new LayoutTestController method.

Reviewed by Antti Koivisto.

       * fast/frames/flattening/frameset-flattening-advanced.html:
* fast/frames/flattening/frameset-flattening-grid.html:
* fast/frames/flattening/frameset-flattening-simple.html:
* fast/frames/flattening/frameset-flattening-subframe-resize.html:
* fast/frames/flattening/frameset-flattening-subframesets.html:
* fast/frames/flattening/iframe-flattening-simple.html: Added.
* platform/qt/fast/frames/flattening/iframe-flattening-simple-expected.txt: Added.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@56718 268f45cc-cd09-0410-ab3c-d52691b4dbfc