[Webkit-unassigned] [Bug 110164] New: Web Inspector: provide the id of associated nodes for layers when calling InspectorLayerTreeAgent::getLayerTree()

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=110164

           Summary: Web Inspector: provide the id of associated nodes for
                    layers when calling
                    InspectorLayerTreeAgent::getLayerTree()
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Web Inspector
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: graouts at apple.com
                CC: timothy at apple.com, keishi at webkit.org,
                    pmuellr at yahoo.com, joepeck at webkit.org,
                    pfeldman at chromium.org, yurys at chromium.org,
                    apavlov at chromium.org, loislo at chromium.org,
                    vsevik at chromium.org,
                    webkit-bug-importer at group.apple.com,
                    web-inspector-bugs at googlegroups.com


Right now, the layer tree provided by InspectorLayerTreeAgent::getLayerTree() only lists layer ids, but not the id of the layer's associated node. In order to get that id, the front-end needs to call InspectorLayerTreeAgent::nodeIdForLayerId(). However, the frequency of "layerTreeDidChange" events might be high enough that the resulting calls to getLayerTree() and subsequent calls to nodeIdForLayerId() would have the unexpected impacts of obtaining the node ids for layers that were reported too long ago and the layer tree has already changed significantly.

We should let getLayerTree() report node IDs in the returned object without pushing the nodes to the front-end. That way the front-end will be able to use that information without having to request information from the backend with the latency involved.

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