DevTools: [Elements] Implement shortcut-based node cut-copy-pasting

Source/devtools/protocol.json

 {
     "version": { "major": "1", "minor": "1" },
     "domains": [{
         "domain": "Inspector",
         "hidden": true,
         "types": [],
         "commands": [
             {
                 "name": "enable",
                 "description": "Enables inspector domain notifications."
@@ skipping 2276 matching lines @@
                 "name": "getAttributes",
                 "parameters": [
                     { "name": "nodeId", "$ref": "NodeId", "description": "Id of the node to retrieve attibutes for." }
                 ],
                 "returns": [
                     { "name": "attributes", "type": "array", "items": { "type": "string" }, "description": "An interleaved array of node attribute names and values." }
                 ],
                 "description": "Returns attributes for the specified node."
             },
             {
+                "name": "copyTo",
+                "parameters": [
+                    { "name": "nodeId", "$ref": "NodeId", "description": "Id of the node to copy." },
+                    { "name": "targetNodeId", "$ref": "NodeId", "description": "Id of the element to drop the copy into." },
+                    { "name": "insertBeforeNodeId", "$ref": "NodeId", "optional": true, "description": "Drop the copy before this node (if absent, the copy becomes the last child of <code>targetNodeId</code>)." }
+                ],
+                "returns": [
+                    { "name": "nodeId", "$ref": "NodeId", "description": "Id of the node clone." }
+                ],
+                "description": "Creates a deep copy of the specified node and places it into the target container before the given anchor.",
+                "hidden": true
+            },
+            {
                 "name": "moveTo",
                 "parameters": [
-                    { "name": "nodeId", "$ref": "NodeId", "description": "Id of the node to drop." },
-                    { "name": "targetNodeId", "$ref": "NodeId", "description": "Id of the element to drop into." },
-                    { "name": "insertBeforeNodeId", "$ref": "NodeId", "optional": true, "description": "Drop node before given one." }
+                    { "name": "nodeId", "$ref": "NodeId", "description": "Id of the node to move." },
+                    { "name": "targetNodeId", "$ref": "NodeId", "description": "Id of the element to drop the moved node into." },
+                    { "name": "insertBeforeNodeId", "$ref": "NodeId", "optional": true, "description": "Drop node before this one (if absent, the moved node becomes the last child of <code>targetNodeId</code>)." }
                 ],
                 "returns": [
                     { "name": "nodeId", "$ref": "NodeId", "description": "New id of the moved node." }
                 ],
                 "description": "Moves node into the new container, places it before the given anchor."
             },
             {
                 "name": "undo",
                 "description": "Undoes the last performed action.",
                 "hidden": true
@@ skipping 1960 matching lines @@
             {
                 "name": "dataAvailable",
                 "parameters": [
                     {"name": "value", "type": "array", "items": { "$ref": "PowerEvent" }, "description": "List of power events." }
                 ],
                 "handlers": ["browser", "frontend"]
             }
         ]
     }]
 }