[WebSocket] Move WebSocketChannel::FrameData into a separate header file

[WebSocket] Move WebSocketChannel::FrameData into a separate header file
https://bugs.webkit.org/show_bug.cgi?id=78682

Extract WebSocketChannel::FrameData as WebSocketFrame. This brings
flexibility to add classes which want to do something for
incoming/outgoing frames (e.g. compression/decompression).

Reviewed by Kent Tamura.

No new tests. No behavior change.

* GNUmakefile.list.am: AddedWebSocketFrame.h
* Target.pri: Ditto.
* WebCore.gypi: Ditto.
* WebCore.vcproj/WebCore.vcproj: Ditto.
* WebCore.xcodeproj/project.pbxproj: Ditto.
* websockets/WebSocketChannel.cpp: Modified to use WebSocketFrame instead of FrameData
(WebCore):
(WebCore::WebSocketChannel::send):
(WebCore::WebSocketChannel::startClosingHandshake):
(WebCore::WebSocketChannel::parseFrame):
(WebCore::WebSocketChannel::processFrame):
(WebCore::WebSocketChannel::enqueueTextFrame):
(WebCore::WebSocketChannel::enqueueRawFrame):
(WebCore::WebSocketChannel::enqueueBlobFrame):
(WebCore::appendMaskedFramePayload): Added.
(WebCore::makeFrameData): Added.
(WebCore::WebSocketChannel::sendFrame):
* websockets/WebSocketChannel.h: Removed FrameData.
(WebSocketChannel):
(QueuedFrame):
* websockets/WebSocketFrame.h: Added.
(WebCore):
(WebSocketFrame):
(WebCore::WebSocketFrame::isNonControlOpCode):
(WebCore::WebSocketFrame::isControlOpCode):
(WebCore::WebSocketFrame::isReservedOpCode):
(WebCore::WebSocketFrame::WebSocketFrame):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@108240 268f45cc-cd09-0410-ab3c-d52691b4dbfc