sidebar under a collapsable item that contains all the runs.

        https://bugs.webkit.org/show_bug.cgi?id=19713

        Reviewed by Darin Adler.

        * English.lproj/localizedStrings.js: New strings.
        * page/inspector/Images/profileGroupIcon.png: Added.
        * page/inspector/Images/profileSmallIcon.png: Added.
        * page/inspector/ProfilesPanel.js:
        (WebInspector.ProfilesPanel.prototype.reset): Clear _profileGroups.
        Remove the "some-expandable" class from the sidebarTree.
        (WebInspector.ProfilesPanel.prototype.addProfile): Append new profiles
        that have the same name as a previous profile into a group. When a
        group has 2 profiles a ProfileGroupSidebarTreeElement is made and the
        ProfileSidebarTreeElements are appended to the group's element.
        (WebInspector.ProfileSidebarTreeElement.prototype.get mainTitle):
        Return _mainTitle is it is set.
        (WebInspector.ProfileSidebarTreeElement.prototype.set mainTitle):
        Set _mainTitle which is an override title.
        (WebInspector.ProfileGroupSidebarTreeElement): Inherit SidebarTreeElement.
        (WebInspector.ProfileGroupSidebarTreeElement.prototype.onselect):
        Show the last profile in the group when selected.
        * page/inspector/SidebarTreeElement.js:
        (WebInspector.SidebarTreeElement.prototype.get small): Return _small.
        (WebInspector.SidebarTreeElement.prototype.set small): Set _small and
        update the style to match.
        (WebInspector.SidebarTreeElement.prototype.onattach): Set the small
        class if the small property is true.
        * page/inspector/inspector.css: New styles for profiles groups
        and for the small profiles.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@34740 268f45cc-cd09-0410-ab3c-d52691b4dbfc