hg: openjfx/jfx-dev/rt: 8194935: Cherry pick GTK WebKit 2.18.5 changes

[arunprasad.rajkumar at oracle.com]

Changeset: a455aff48e48
Author:    arajkumar
Date:      2018-01-19 12:08 +0530
URL:       http://hg.openjdk.java.net/openjfx/jfx-dev/rt/rev/a455aff48e48

8194935: Cherry pick GTK WebKit 2.18.5 changes
Reviewed-by: mbilla, kcr

! modules/javafx.web/src/main/native/Source/JavaScriptCore/runtime/JSGlobalObject.cpp
! modules/javafx.web/src/main/native/Source/JavaScriptCore/runtime/JSGlobalObject.h
! modules/javafx.web/src/main/native/Source/WTF/wtf/Platform.h
! modules/javafx.web/src/main/native/Source/WebCore/Modules/mediastream/libwebrtc/LibWebRTCMediaEndpoint.cpp
! modules/javafx.web/src/main/native/Source/WebCore/page/Performance.cpp
! modules/javafx.web/src/main/native/Source/cmake/OptionsGTK.cmake
! modules/javafx.web/src/main/native/Tools/gtk/gtkdoc.py