Event dispatching in XMLHttpRequestProgressEventThrottle should go through XMLHttpRequestProgressEventThrottle::dispatchEvent
https://bugs.webkit.org/show_bug.cgi?id=46743

Patch by Allan Sandfeld Jensen <allan.jensen@nokia.com> on 2012-03-22
Reviewed by Julien Chaffraix
Based on original patch by Anton D'Auria

In preparation for platform-specific queuing of XMLHttpRequest events,
this patch changes all calls to m_target->dispatchEvent to
XMLHttpRequestProgressEventThrottle::dispatchEvent.
Currently, we queue only one progress event on suspend() if we have
throttled progress events. We should be able to queue all XHR events
that can be generated after suspend(), if the platform network layer
continues to receive data.
XMLHttpRequest uses XMLHttpRequestProgressEventThrottle to dispatch only
download events, so this doesn't change behavior of upload events, which
aren't throttled or queued.

* xml/XMLHttpRequest.cpp:
(WebCore::XMLHttpRequest::callReadyStateChangeListener):
* xml/XMLHttpRequestProgressEventThrottle.cpp:
(WebCore::XMLHttpRequestProgressEventThrottle::dispatchReadyStateChangeEvent):
(WebCore::XMLHttpRequestProgressEventThrottle::dispatchEvent):
(WebCore::XMLHttpRequestProgressEventThrottle::flushProgressEvent):
(WebCore::XMLHttpRequestProgressEventThrottle::dispatchPausedEvent):
(WebCore::XMLHttpRequestProgressEventThrottle::fired):
* xml/XMLHttpRequestProgressEventThrottle.h:
(XMLHttpRequestProgressEventThrottle):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@111717 268f45cc-cd09-0410-ab3c-d52691b4dbfc