https://bugs.webkit.org/show_bug.cgi?id=86382

Reviewed by Darin Adler.

Source/JavaScriptCore: 

Add flag to GCActivityCallback to enable / disable activity timer.
Add api via Heap to set the flag's value.

* JavaScriptCore.vcproj/JavaScriptCore/JavaScriptCore.def: Windows export
* heap/Heap.cpp:
(JSC::Heap::setGarbageCollectionTimerEnabled):
* heap/Heap.h:
* runtime/GCActivityCallback.h:
(JSC::GCActivityCallback::isEnabled):
(JSC::GCActivityCallback::setEnabled):
(JSC::GCActivityCallback::GCActivityCallback):
* runtime/GCActivityCallbackCF.cpp:
(JSC::DefaultGCActivityCallbackPlatformData::timerDidFire):

Source/WebCore: 

Plumbing to set / clear JS GC activity timer enable flag.

* WebCore.exp.in:
* bindings/js/GCController.cpp:
(WebCore::GCController::setJavaScriptGarbageCollectorTimerEnabled):
* bindings/js/GCController.h:

Source/WebKit/mac: 

Plumbing to set / clear JS GC activity timer enable flag.

* Misc/WebCoreStatistics.h:
* Misc/WebCoreStatistics.mm:
(+[WebCoreStatistics setJavaScriptGarbageCollectorTimerEnabled:]):

Source/WebKit2: 

Plumbing to set / clear JS GC activity timer enable flag.

* UIProcess/API/C/WKContext.cpp:
(WKContextSetJavaScriptGarbageCollectorTimerEnabled):
* UIProcess/API/C/WKContext.h:
* UIProcess/WebContext.cpp:
(WebKit::WebContext::setJavaScriptGarbageCollectorTimerEnabled):
* UIProcess/WebContext.h:
* WebProcess/WebProcess.cpp:
(WebKit::WebProcess::setJavaScriptGarbageCollectorTimerEnabled):
* WebProcess/WebProcess.h:
* WebProcess/WebProcess.messages.in:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@117015 268f45cc-cd09-0410-ab3c-d52691b4dbfc