Reviewed by Pavel Feldman.

        Web Inspector: [Chromium] Landing detailed heap snapshots, part 3.
        https://bugs.webkit.org/show_bug.cgi?id=54385

        Provide node classes for data grid views:
         - summary -- list of objects by constuctor;
         - diff -- summaries btw two snapshots;
         - explorer -- explore heap graph;
         - dominators tree;

        * WebCore.gypi:
        * WebCore.vcproj/WebCore.vcproj:
        * inspector/front-end/DetailedHeapshotGridNodes.js: Added.
        * inspector/front-end/HeapSnapshot.js:
        (WebInspector.HeapSnapshotFilteredOrderedIterator):
        (WebInspector.HeapSnapshotFilteredOrderedIterator.prototype.incInstancesCount):
        (WebInspector.HeapSnapshotFilteredOrderedIterator.prototype.get instancesCount):
        (WebInspector.HeapSnapshotFilteredOrderedIterator.prototype.next):
        (WebInspector.HeapSnapshotFilteredOrderedIterator.prototype.resetInstancesCount):
        (WebInspector.HeapSnapshotEdgesProvider):
        (WebInspector.HeapSnapshotNodesProvider):
        * inspector/front-end/PleaseWaitMessage.js:
        (WebInspector.PleaseWaitMessage.prototype.get instance):
        * inspector/front-end/WebKit.qrc:
        * inspector/front-end/inspector.html:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@78700 268f45cc-cd09-0410-ab3c-d52691b4dbfc