DevTools: Split creating inspector stylesheet and adding a new rule into stylesheet in protocol.

Source/devtools/protocol.json

Index: Source/devtools/protocol.json
diff --git a/Source/devtools/protocol.json b/Source/devtools/protocol.json
index 0e54f2b3da35b52a508ec9a0f4afe9fc43bd15f8..46802390fa4943f8486d03f1dff93c6082edfe94 100644
--- a/Source/devtools/protocol.json
+++ b/Source/devtools/protocol.json
@@ -2671,15 +2671,25 @@
                 "description": "Modifies the rule selector."
             },
             {
+                "name": "createStyleSheet",
+                "parameters": [
+                    { "name": "frameId", "$ref": "Page.FrameId", "description": "Identifier of the frame where \"via-inspector\" stylesheet should be created."}
+                ],
+                "returns": [
+                    { "name": "styleSheetId", "$ref": "StyleSheetId", "description": "Identifier of the created \"via-inspector\" stylesheet." }
+                ],
+                "description": "Creates a new special \"via-inspector\" stylesheet in the frame with given <code>frameId</code>."
+            },
+            {
                 "name": "addRule",
                 "parameters": [
-                    { "name": "contextNodeId", "$ref": "DOM.NodeId" },
+                    { "name": "styleSheetId", "$ref": "StyleSheetId" },
                     { "name": "selector", "type": "string" }
                 ],
                 "returns": [
                     { "name": "rule", "$ref": "CSSRule", "description": "The newly created rule." }
                 ],
-                "description": "Creates a new empty rule with the given <code>selector</code> in a special \"inspector\" stylesheet in the owner document of the context node."
+                "description": "Creates a new empty rule with the given <code>selector</code> in a stylesheet with given <code>styleSheetId</code>."
             },
             {
                 "name": "forcePseudoState",