https://bugs.webkit.org/show_bug.cgi?id=97237

Patch by Evan Wallace <evan.exe@gmail.com> on 2012-09-21
Reviewed by Alexey Proskuryakov.

WebSocketChannel always reallocates its internal buffer when it receives
and appends new data which causes dramatic slowdowns for messages over
2 MB in size. This patch changes the internal buffer of WebSocketChannel
from a raw char array to a Vector<char> and uses its amortized append()
method. This brings the time to receive a 5 MB message from 5.2 seconds
to 0.25 seconds.

This patch is only for optimization. No new tests are needed.

* Modules/websockets/WebSocketChannel.cpp:
(WebCore::WebSocketChannel::WebSocketChannel):
(WebCore::WebSocketChannel::~WebSocketChannel):
(WebCore::WebSocketChannel::fail):
(WebCore::WebSocketChannel::resume):
(WebCore::WebSocketChannel::didReceiveSocketStreamData):
(WebCore::WebSocketChannel::appendToBuffer):
(WebCore::WebSocketChannel::skipBuffer):
(WebCore::WebSocketChannel::processBuffer):
(WebCore::WebSocketChannel::resumeTimerFired):
(WebCore::WebSocketChannel::processFrame):
* Modules/websockets/WebSocketChannel.h:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@129239 268f45cc-cd09-0410-ab3c-d52691b4dbfc