Web Inspector: Introduce Workspace make it UISourceCode provider for ScriptsPanel.

Web Inspector: Introduce Workspace make it UISourceCode provider for ScriptsPanel.
https://bugs.webkit.org/show_bug.cgi?id=90466

Reviewed by Pavel Feldman.

Introduced WebInspector.Workspace as a model (UISourceCode provider) behind ScriptsPanel.

* WebCore.gypi:
* WebCore.vcproj/WebCore.vcproj:
* inspector/compile-front-end.py:
* inspector/front-end/ScriptsPanel.js:
* inspector/front-end/WebKit.qrc:
* inspector/front-end/Workspace.js: Added.
(WebInspector.CompositeUISourceCodeProvider):
(WebInspector.CompositeUISourceCodeProvider.prototype._registerUISourceCodeProvider):
(WebInspector.CompositeUISourceCodeProvider.prototype._handleUISourceCodeAdded):
(WebInspector.CompositeUISourceCodeProvider.prototype._handleUISourceCodeReplaced):
(WebInspector.CompositeUISourceCodeProvider.prototype._handleUISourceCodeRemoved):
(WebInspector.CompositeUISourceCodeProvider.prototype.uiSourceCodes):
(WebInspector.Workspace):
(WebInspector.Workspace.prototype.registerUISourceCodeProvider):
* inspector/front-end/inspector.html:
* inspector/front-end/inspector.js:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@121778 268f45cc-cd09-0410-ab3c-d52691b4dbfc