DevTools: implement enable/disable commands in DOMAgent

Source/devtools/protocol.json

Index: Source/devtools/protocol.json
diff --git a/Source/devtools/protocol.json b/Source/devtools/protocol.json
index 58ed28f4e731d663a37b670a7eb9aabfd9483f2d..dd2b79e1cc6a26a6f679debdc6aeed362e8115d2 100644
--- a/Source/devtools/protocol.json
+++ b/Source/devtools/protocol.json
@@ -1972,6 +1972,14 @@
         ],
         "commands": [
             {
+                "name": "enable",
+                "description": "Enables DOM agent for the given page."
+            },
+            {
+                "name": "disable",
+                "description": "Disables DOM agent for the given page."
+            },
+            {
                 "name": "getDocument",
                 "returns": [
                     { "name": "root", "$ref": "Node", "description": "Resulting node." }