https://bugs.webkit.org/show_bug.cgi?id=67171

Reviewed by Simon Fraser.

Source/JavaScriptCore:

Added WTF_USE_REQUEST_ANIMATION_FRAME_TIMER to allow any platform to run
requestAnimationFrame callbacks on a Timer defined in ScriptedAnimationController.
Currently only enabled for PLATFORM(MAC)

* wtf/Platform.h:

Source/WebCore:

Changed requestAnimationFrame to use a Timer in ScriptedAnimationController
on Mac, rather than runLoopObservers. The Timer is throttled to fire no
faster than every 15ms. It is behind a WTF_USE_REQUEST_ANIMATION_FRAME_TIMER
flag and can be used by any implementation, but currently it is only enabled
by PLATFORM(MAC).

* dom/ScriptedAnimationController.cpp:
(WebCore::ScriptedAnimationController::ScriptedAnimationController):
(WebCore::ScriptedAnimationController::resume):
(WebCore::ScriptedAnimationController::registerCallback):
(WebCore::ScriptedAnimationController::serviceScriptedAnimations):
(WebCore::ScriptedAnimationController::scheduleAnimation):
(WebCore::ScriptedAnimationController::animationTimerFired):
* dom/ScriptedAnimationController.h:
* loader/EmptyClients.h:
* page/Chrome.cpp:
(WebCore::Chrome::scheduleAnimation):
* page/ChromeClient.h:

Source/WebKit/mac:

Removed runLoopObserver for requestAnimationFrame. It's now
done by a Timer in ScriptedAnimationController in WebCore.

* WebCoreSupport/WebChromeClient.h:
* WebCoreSupport/WebChromeClient.mm:
* WebView/WebView.mm:
(-[WebView _close]):
* WebView/WebViewData.h:
* WebView/WebViewInternal.h:

Source/WebKit2:

Removed runLoopObserver for requestAnimationFrame. It's now
done by a Timer in ScriptedAnimationController in WebCore.

* WebProcess/WebCoreSupport/WebChromeClient.cpp:
* WebProcess/WebCoreSupport/WebChromeClient.h:
* WebProcess/WebPage/WebPage.cpp:
(WebKit::WebPage::~WebPage):
* WebProcess/WebPage/WebPage.h:
* WebProcess/WebPage/mac/WebPageMac.mm:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@94908 268f45cc-cd09-0410-ab3c-d52691b4dbfc