Revert RenderTheme paint and layout functions to ints

Revert RenderTheme paint and layout functions to ints
https://bugs.webkit.org/show_bug.cgi?id=82196

Reviewed by Julien Chaffraix.

When dealing with object that are rendered outside of WebCore, we do all necessary pixel snapping
before passing coordinates to the external code. RenderTheme encompasses a set of objects whose
rendering is influenced by the platform. This change reverts the interface between this platform
code and WebCore to be integers.

Some platforms, such as Mac, use sub-pixel units for layout and rendering, but it's still not
desirable to pass sub-pixel values to these API's, because ultimately we'll render these objects
at whole-pixel values to avoid anti-aliasing.

Marking touched overridden virtual functions as OVERRIDE. There are many more to update.

No new tests. No change in behavior.

* platform/graphics/FractionalLayoutRect.h:
(WebCore::FractionalLayoutRect::pixelSnappedLocation): Convenience function.
(WebCore::FractionalLayoutRect::pixelSnappedSize): Ditto.
(FractionalLayoutRect):
* platform/graphics/IntRect.h:
(WebCore::IntRect::pixelSnappedLocation): Temporary mirrors to the functions of the same name on
FractionalLayoutRect.
(WebCore::IntRect::pixelSnappedSize): Ditto.
* rendering/RenderBox.cpp:
(WebCore::RenderBox::paintBoxDecorations): Adding a local pixel snapped paint rect to avoid
repeated pixel snapping.
* rendering/RenderBox.h:
(WebCore::RenderBox::absoluteContentBox): Reverting to integers since this represents on-screen
coordinates
(WebCore::RenderBox::pixelSnappedSize): Convenience method.
* rendering/RenderMediaControls.cpp:
(WebCore::RenderMediaControls::volumeSliderOffsetFromMuteButton): This static function is only called
from RenderTheme platform code. Changing it to operate on pixel snapped values since we don't want
to pipe LayoutUnits through that code.
* rendering/RenderMeter.cpp:
(WebCore::RenderMeter::computeLogicalWidth): Changing to feed pixel snapped values into the platform
code to properly determine the resulting meter size.
(WebCore::RenderMeter::computeLogicalHeight): Ditto.
* rendering/RenderTheme.cpp:
(WebCore::RenderTheme::paint):
(WebCore::RenderTheme::volumeSliderOffsetFromMuteButton):
(WebCore::RenderTheme::adjustRepaintRect):
(WebCore::RenderTheme::meterSizeForBounds):
* rendering/RenderTheme.h:
(RenderTheme):
(WebCore::RenderTheme::paintCapsLockIndicator):
* rendering/RenderThemeChromiumMac.h:
(RenderThemeChromiumMac):
* rendering/RenderThemeChromiumSkia.cpp:
(WebCore::RenderThemeChromiumSkia::convertToPaintingRect):
(WebCore::RenderThemeChromiumSkia::paintSearchFieldCancelButton):
(WebCore::RenderThemeChromiumSkia::paintSearchFieldResultsDecoration):
(WebCore::RenderThemeChromiumSkia::paintSearchFieldResultsButton):
* rendering/RenderThemeChromiumSkia.h:
* rendering/RenderThemeMac.h:
(RenderThemeMac):
* rendering/RenderThemeMac.mm:
(WebCore::RenderThemeMac::adjustRepaintRect):
(WebCore::RenderThemeMac::inflateRect):
(WebCore::RenderThemeMac::convertToPaintingRect):
(WebCore::RenderThemeMac::setControlSize):
(WebCore::RenderThemeMac::paintCapsLockIndicator):
(WebCore::RenderThemeMac::paintMenuList):
(WebCore::RenderThemeMac::meterSizeForBounds):
(WebCore::RenderThemeMac::setPopupButtonCellState):
(WebCore::RenderThemeMac::paintSearchFieldCancelButton):
(WebCore::RenderThemeMac::volumeSliderOffsetFromMuteButton):
* rendering/RenderThemeWin.cpp:
(WebCore::RenderThemeWin::volumeSliderOffsetFromMuteButton):
* rendering/RenderThemeWin.h:
(RenderThemeWin):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@113030 268f45cc-cd09-0410-ab3c-d52691b4dbfc