Reviewed by Darin.

        <rdar://problem/5951532> JSProfiler: Implement Bottom-Up view (19228)
        - Subclass TreeProfile as I prepare for a HeavyProfile to be comming
        later.

        * JavaScriptCore.xcodeproj/project.pbxproj:
        * profiler/Profile.cpp: By default we create a TreeProfile.
        (KJS::Profile::create):
        * profiler/Profile.h: Changes to the Profile class to make it amenable
        to be inherited from.
        (KJS::Profile::~Profile):
        * profiler/TreeProfile.cpp: Added.
        (KJS::TreeProfile::create):
        (KJS::TreeProfile::TreeProfile):
        (KJS::TreeProfile::heavyProfile):
        * profiler/TreeProfile.h: Added.
        (KJS::TreeProfile::treeProfile):



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@34960 268f45cc-cd09-0410-ab3c-d52691b4dbfc