Upstream SharedTimerIOS.mm

Upstream SharedTimerIOS.mm
<http://webkit.org/b/110161>

Reviewed by Benjamin Poulain.

* Configurations/WebCore.xcconfig:
(EXCLUDED_SOURCE_FILE_NAMES_iphoneos): Add SharedTimerMac.mm.
* WebCore.xcodeproj/project.pbxproj: Add SharedTimerIOS.mm.
* platform/ios/SharedTimerIOS.mm: Add.
(WebCore):
(-[WebCoreResumeNotifierIOS init]):
(-[WebCoreResumeNotifierIOS dealloc]):
(-[WebCoreResumeNotifierIOS didWake]):
(WebCore::setSharedTimerFiredFunction):
(WebCore::timerFired):
(WebCore::setSharedTimerFireInterval):
(WebCore::stopSharedTimer):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@143550 268f45cc-cd09-0410-ab3c-d52691b4dbfc