[WK2] Add C API for Battery Status API

[WK2] Add C API for Battery Status API
https://bugs.webkit.org/show_bug.cgi?id=90545

Patch by Christophe Dumez <christophe.dumez@intel.com> on 2012-07-05
Reviewed by Anders Carlsson.

Add C API for WKBatteryManager and WKBatteryStatus
so that clients can support the Battery Status API
in WebKit2.

* CMakeLists.txt:
* GNUmakefile.list.am:
* Target.pri:
* UIProcess/API/C/WKBatteryManager.cpp:
(WKBatteryManagerProviderDidChangeBatteryStatus):
(WKBatteryManagerProviderUpdateBatteryStatus):
* UIProcess/API/C/WKBatteryStatus.cpp: Copied from Source/WebKit2/UIProcess/API/C/WKBatteryManager.cpp.
(WKBatteryStatusGetTypeID):
(WKBatteryStatusCreate):
* UIProcess/API/C/WKBatteryStatus.h: Copied from Source/WebKit2/UIProcess/API/C/WKBatteryManager.cpp.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@121919 268f45cc-cd09-0410-ab3c-d52691b4dbfc