Need to be able to configure Geolocation policy regarding user permissions

Need to be able to configure Geolocation policy regarding user permissions
https://bugs.webkit.org/show_bug.cgi?id=42068

Patch by Mahesh Kulkarni <mahesh.kulkarni@nokia.com> on 2010-07-20
Reviewed by Steve Block.

JavaScriptCore:

If CLIENT_BASED_GEOLOCATION is enabled, enable preemtive permission policy
by default

* wtf/Platform.h:

WebCore:

Introducing new USE() flag PREEMPT_GEOLOCATION_PREMISSION using which
acquires user permission first before starting location service

This change does not introduce any change in behavior for any platform. So there are no new tests
added.

* WebCore.pro:
* page/Geolocation.cpp:
(WebCore::Geolocation::startRequest):
(WebCore::Geolocation::setIsAllowed):
(WebCore::Geolocation::startUpdating):
* page/Geolocation.h:

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@63742 268f45cc-cd09-0410-ab3c-d52691b4dbfc