Don't create new UIWindow for video fullscreen.

Don't create new UIWindow for video fullscreen.
https://bugs.webkit.org/show_bug.cgi?id=135038

Patch by Jeremy Jones <jeremyj@apple.com> on 2014-07-22
Reviewed by Darin Adler.

Source/WebCore:
* WebCore.exp.in:
* platform/ios/WebVideoFullscreenControllerAVKit.h: use UIView instead of UIScreen.
* platform/ios/WebVideoFullscreenControllerAVKit.mm:
(-[WebVideoFullscreenController enterFullscreen:]): provide parent UIView.
* platform/ios/WebVideoFullscreenInterfaceAVKit.h: remove UIWindow.
* platform/ios/WebVideoFullscreenInterfaceAVKit.mm:
(WebVideoFullscreenInterfaceAVKit::setupFullscreen): ditto
(WebVideoFullscreenInterfaceAVKit::cleanupFullscreen): ditto
(WebVideoFullscreenInterfaceAVKit::invalidate): ditto
(WebVideoFullscreenInterfaceAVKit::requestHideAndExitFullscreen): ditto

Source/WebKit/mac:
Provide UIView to WebVideoFullscreenController

* WebView/WebView.mm:
(-[WebView _enterFullscreenForNode:]): pass UIView instead of nil

Source/WebKit2:
Use root UIView to parent fullscreen interface.

* UIProcess/ios/WebVideoFullscreenManagerProxy.mm:
(WebKit::WebVideoFullscreenManagerProxy::setupFullscreenWithID): pass parent UIView
* WebProcess/ios/WebVideoFullscreenManager.mm:
(WebKit::screenRectForNode): Use client rect instead of screen rect.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@171345 268f45cc-cd09-0410-ab3c-d52691b4dbfc