Move rendering/RenderLayer* to layout/

Source/devtools/protocol.json

 {
     "version": { "major": "1", "minor": "1" },
     "domains": [{
         "domain": "Inspector",
         "hidden": true,
         "types": [],
         "commands": [
             {
                 "name": "enable",
                 "description": "Enables inspector domain notifications."
@@ skipping 4360 matching lines @@
         ],
         "events": []
     },
     {
         "domain": "LayerTree",
         "hidden": true,
         "types": [
             {
                 "id": "LayerId",
                 "type": "string",
-                "description": "Unique RenderLayer identifier."
+                "description": "Unique Layer identifier."
             },
             {
                 "id": "SnapshotId",
                 "type": "string",
                 "description": "Unique snapshot identifier."
             },
             {
                 "id": "ScrollRect",
                 "type": "object",
                 "description": "Rectangle where scrolling happens on the main thread.",
@@ skipping 413 matching lines @@
             {
                 "name": "animationPlayerCreated",
                 "parameters": [
                     { "name": "player", "$ref": "AnimationPlayer", "description": "AnimationPlayer that was created." }
                 ],
                 "hidden": true
             }
         ]
     }]
 }