Web Inspector: start searching from the cursor position in the Sources panel.

Web Inspector: start searching from the cursor position in the Sources panel.
https://bugs.webkit.org/show_bug.cgi?id=90677

Reviewed by Vsevolod Vlasov.

Web Inspector: start searching from the cursor position in the Sources panel.
Drive-by: select whole match upon search cancel.
* inspector/front-end/ScriptsPanel.js:
(WebInspector.ScriptsPanel.prototype.performSearch.finishedCallback):
(WebInspector.ScriptsPanel.prototype.performSearch):
* inspector/front-end/SourceFrame.js:
(WebInspector.SourceFrame.prototype.performSearch.doFindSearchMatches):
(WebInspector.SourceFrame.prototype.performSearch):
* inspector/front-end/TextEditor.js:
(WebInspector.TextEditor.prototype.lastSelection):
(WebInspector.TextEditor.prototype._handleFocused):
* inspector/front-end/TextEditorModel.js:
(WebInspector.TextRange.prototype.serializeToObject):
(WebInspector.TextRange.prototype.compareTo):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@121957 268f45cc-cd09-0410-ab3c-d52691b4dbfc