Merged PR 64: CCLayerTree: Add extended fields to inspect the copied …

…parts of the layer tree for the impl thread

- Adds an extended field to retrieve the LayerTreeHostImpl (layer tree host equivalent for the impl thread) from a LayerTreeHost.
 - Adds an extended field to retrieve the sync tree (either the active or pending LayerTreeImpl) from a LayerTreeHostImpl.
 - Adds an extended field to retrieve the LayerImpl (layer equivalent for the impl thread) from a Layer.

extensions/target-specific/chromium/cclayertree/cclayertree.js

@@ -56,6 +56,26 @@ Loader.OnLoad(function() {
         return TreeInspector.GetActions("cclayertree", "CCLayerTree", layer);
     });
 
+    DbgObject.AddExtendedField(Chromium.RendererProcessType("cc::LayerTreeHost"), "layer_tree_host_impl_", Chromium.RendererProcessType("cc::LayerTreeHostImpl"), UserEditableFunctions.Create((layerTreeHost) => {
+        return layerTreeHost.f("proxy_").F("Object").vcast().f("proxy_impl_").F("Object").f("host_impl_").F("Object");
+    }));
+
+    DbgObject.AddExtendedField(Chromium.RendererProcessType("cc::LayerTreeHostImpl"), "sync_tree_", Chromium.RendererProcessType("cc::LayerTreeImpl"), UserEditableFunctions.Create((layerTreeHostImpl) => {
+        return layerTreeHostImpl.f("settings_").f("commit_to_active_tree").val()
+        .then((commitToActiveTree) => commitToActiveTree ? layerTreeHostImpl.f("active_tree_").F("Object") : layerTreeHostImpl.f("pending_tree_").F("Object"));
+    }));
+
+    DbgObject.AddExtendedField(Chromium.RendererProcessType("cc::Layer"), "layer_impl_", Chromium.RendererProcessType("cc::LayerImpl"), UserEditableFunctions.Create((layer) => {
+        return layer.f("layer_tree_host_").F("layer_tree_host_impl_").F("sync_tree_").f("layers_").F("Object").array("Elements").filter((layerImpl) => {
+            return Promise.all([layer.desc("layer_id_"), layerImpl.F("Object").f("layer_id_").val()])
+            .thenAll((layerId, layerImplId) => layerId == layerImplId);
+        })
+        .then((layerImpl) => {
+            console.assert(layerImpl.length <= 1);
+            return (layerImpl.length == 1) ? layerImpl[0].F("Object").vcast() : DbgObject.NULL;
+        });
+    }));
+
     DbgObject.AddTypeDescription(
         Chromium.RendererProcessType("cc::Layer"),
         "bounds",
@@ -65,7 +85,7 @@ Loader.OnLoad(function() {
 
     DbgObject.AddTypeDescription(
         Chromium.RendererProcessType("cc::Layer"),
-        "layer_id",
+        "layer_id_",
         false,
         UserEditableFunctions.Create((layer) => layer.f("inputs_").f("layer_id").val())
     );