https://bugs.webkit.org/show_bug.cgi?id=95923

Patch by Hojong Han <hojong.han@samsung.com> on 2013-06-03
Reviewed by Geoffrey Garen.

Implements the activity triggered garbage collector.
Additional GCs can be triggered by platfrom timer.
It has sort of compaction effect not to make JSC heap grow fast
so that memory usage becomes lower than usual.

* PlatformEfl.cmake: Added.
* heap/HeapTimer.cpp:
(JSC):
(JSC::HeapTimer::HeapTimer):
(JSC::HeapTimer::~HeapTimer):
(JSC::HeapTimer::add):
(JSC::HeapTimer::stop):
(JSC::HeapTimer::timerEvent):
* heap/HeapTimer.h:
(HeapTimer):
* jsc.cpp:
(main):
* runtime/GCActivityCallback.cpp:
(JSC):
(JSC::DefaultGCActivityCallback::DefaultGCActivityCallback):
(JSC::DefaultGCActivityCallback::scheduleTimer):
(JSC::DefaultGCActivityCallback::cancelTimer):
(JSC::DefaultGCActivityCallback::didAllocate):
* runtime/GCActivityCallback.h:
(GCActivityCallback):
(JSC::GCActivityCallback::GCActivityCallback):
(DefaultGCActivityCallback):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@151149 268f45cc-cd09-0410-ab3c-d52691b4dbfc