DevTools: introduce CSS.setStyleText, we'll migrate setPropertyText to it later.

Source/devtools/protocol.json

Index: Source/devtools/protocol.json
diff --git a/Source/devtools/protocol.json b/Source/devtools/protocol.json
index 090678dbf1739e49d87fc4126ed6f37af69bc981..7f50b7ab5c672dfcf4d442e6454d1046bd179d15 100644
--- a/Source/devtools/protocol.json
+++ b/Source/devtools/protocol.json
@@ -3027,6 +3027,18 @@
                 "description": "Modifies the rule selector."
             },
             {
+                "name": "setStyleText",
+                "parameters": [
+                    { "name": "styleSheetId", "$ref": "StyleSheetId" },
+                    { "name": "range", "$ref": "SourceRange" },
+                    { "name": "text", "type": "string" }
+                ],
+                "returns": [
+                    { "name": "rule", "$ref": "CSSStyle", "description": "The resulting style after the selector modification." }
+                ],
+                "description": "Modifies the style text."
+            },
+            {
                 "name": "setMediaText",
                 "parameters": [
                     { "name": "styleSheetId", "$ref": "StyleSheetId" },