[EFL][WK2] Convert from device view size to UI view size only in EwkView.
https://bugs.webkit.org/show_bug.cgi?id=110197

Patch by Huang Dongsung <luxtella@company100.net> on 2013-03-06
Reviewed by Kenneth Rohde Christiansen.

Signed off for WebKit2 by Benjamin Poulain.

Device scale factor is a property of the physical display, so only EwkView
should deal with converting device view size to UI (a.k.a Density Independent Pixel)
view size. It increases readability because we can regard a view size in
other classes (e.g. WebView, PageViewportController, WebPage) except for
EwkView as UI size.

* UIProcess/API/efl/EwkView.cpp:
(EwkView::setDeviceScaleFactor):
(EwkView::setDeviceSize):
(EwkView::size):
(EwkView::deviceSize):
(EwkView::scheduleUpdateDisplay):
(EwkView::createGLSurface):
(EwkView::handleEvasObjectCalculate):
* UIProcess/API/efl/EwkView.h:
(EwkView):
* UIProcess/efl/WebView.cpp:
(WebKit::WebView::paintToCurrentGLContext):
(WebKit::WebView::updateViewportSize):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@144899 268f45cc-cd09-0410-ab3c-d52691b4dbfc