[Chromium] Remove screen-related functions from PlatformSupport
https://bugs.webkit.org/show_bug.cgi?id=97474

Reviewed by Adam Barth.

Screen-related functions like screenHorizontalDPI that
used to be on PlatformSupport are now accessed through a new
PlatformPageClient attached to Widget in WebCore-land, which is
implemented by ChromeClientImpl in WebKit-land, which proxies
calls to WebWidgetClient, which is actually implemented in
Chromium-land.

Source/Platform:

* Platform.gypi:
* chromium/public/WebScreenInfo.h: Added.
(WebKit):
(WebScreenInfo):
(WebKit::WebScreenInfo::WebScreenInfo):

Source/WebCore:

* WebCore.gypi:
* platform/Widget.h:
* platform/chromium/PageClientChromium.h: Copied from Source/WebCore/platform/chromium/PlatformWidget.h.
(PageClientChromium):
* platform/chromium/PlatformScreenChromium.cpp:
(WebCore::toPlatformPageClient):
(WebCore):
(WebCore::screenHorizontalDPI):
(WebCore::screenVerticalDPI):
(WebCore::screenDepth):
(WebCore::screenDepthPerComponent):
(WebCore::screenIsMonochrome):
(WebCore::screenRect):
(WebCore::screenAvailableRect):
* platform/chromium/PlatformSupport.h:
(PlatformSupport):

Source/WebKit/chromium:

* public/WebScreenInfo.h:
* src/ChromeClientImpl.cpp:
(WebKit::ChromeClientImpl::screenInfo):
(WebKit):
* src/ChromeClientImpl.h:
(WebKit):
(WebKit::ChromeClientImpl::platformPageClient):
(ChromeClientImpl):
* src/PlatformSupport.cpp:
(WebCore):
* src/WebPagePopupImpl.cpp:


git-svn-id: https://svn.webkit.org/repository/webkit/trunk/Source/Platform/chromium/public@132419 268f45cc-cd09-0410-ab3c-d52691b4dbfc