Web Inspector: save and restore source positions in back/forward history

Web Inspector: save and restore source positions in back/forward history
https://bugs.webkit.org/show_bug.cgi?id=122062

Patch by Brian J. Burg <burg@cs.washington.edu> on 2013-10-02
Reviewed by Timothy Hatcher.

Previously, the back/forward entries comprised of only the content
views, but not their positions if navigated via hyperlink (i.e.,
handling script.js:42).  When multiple instances of the same
content view appeared in the back/forward list, the most recent
navigation was displayed rather than the linked position.

We now store context necessary to re-navigate such hyperlinks by
storing view- specific data inside a cookie object, and invoke a
supplied callback to take any position initialization actions,
such as calling TextEditor.revealPosition.  This state is
encapsulated into BackForwardEntry instances.

Functions that save and restore scroll positions inside content
views have been changed to store state in BackForwardEntry
instances, so multiple scroll positions can be saved for a content
view appearing in the navigation history more than once.

* UserInterface/BackForwardEntry.js: Added.
(WebInspector.BackForwardEntry):
(WebInspector.BackForwardEntry.prototype.get contentView):
(WebInspector.BackForwardEntry.prototype.get cookie):
(WebInspector.BackForwardEntry.prototype.prepareToShow):
(WebInspector.BackForwardEntry.prototype.prepareToHide):
(WebInspector.BackForwardEntry.prototype._restoreFromCookie):
(WebInspector.BackForwardEntry.prototype._restoreScrollPositions):
(WebInspector.BackForwardEntry.prototype._saveScrollPositions):
* UserInterface/ContentBrowser.js:
(WebInspector.ContentBrowser.prototype.showContentView):
(WebInspector.ContentBrowser.prototype._updateContentViewNavigationItems):
(WebInspector.ContentBrowser.prototype._updateFindBanner):
* UserInterface/ContentViewContainer.js:
(WebInspector.ContentViewContainer.prototype.get currentContentView):
(WebInspector.ContentViewContainer.prototype.get currentBackForwardEntry):
(WebInspector.ContentViewContainer.prototype.showContentView):
(WebInspector.ContentViewContainer.prototype.showBackForwardEntryForIndex):
(WebInspector.ContentViewContainer.prototype.replaceContentView):
(WebInspector.ContentViewContainer.prototype.closeAllContentViewsOfPrototype):
(WebInspector.ContentViewContainer.prototype.closeAllContentViews):
(WebInspector.ContentViewContainer.prototype.goBack):
(WebInspector.ContentViewContainer.prototype.goForward):
(WebInspector.ContentViewContainer.prototype.shown):
(WebInspector.ContentViewContainer.prototype.hidden):
(WebInspector.ContentViewContainer.prototype._showEntry):
(WebInspector.ContentViewContainer.prototype._hideEntry):
* UserInterface/Main.html:
* UserInterface/Main.js:
(WebInspector.openURL):
* UserInterface/ResourceSidebarPanel.js:
(WebInspector.ResourceSidebarPanel.prototype.restoreCallback):
(WebInspector.ResourceSidebarPanel.prototype.showSourceCode):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@156809 268f45cc-cd09-0410-ab3c-d52691b4dbfc