DevTools: [CSS] Add CSS.editRangeInStyleSheetText() to the protocol

Source/devtools/protocol.json

 {
     "version": { "major": "1", "minor": "1" },
     "domains": [{
         "domain": "Inspector",
         "hidden": true,
         "types": [],
         "commands": [
             {
                 "name": "enable",
                 "description": "Enables inspector domain notifications."
@@ skipping 2626 matching lines @@
                     { "name": "text", "type": "string", "description": "The stylesheet text." }
                 ],
                 "description": "Returns the current textual content and the URL for a stylesheet."
             },
             {
                 "name": "setStyleSheetText",
                 "parameters": [
                     { "name": "styleSheetId", "$ref": "StyleSheetId" },
                     { "name": "text", "type": "string" }
                 ],
-                "description": "Sets the new stylesheet text, thereby invalidating all existing <code>CSSStyleId</code>'s and <code>CSSRuleId</code>'s contained by this stylesheet."
+                "description": "Sets the new stylesheet text. This will invalidate all existing <code>CSSStyleId</code>s and <code>CSSRuleId</code>s contained by this stylesheet."
+            },
+            {
+                "name": "editRangeInStyleSheetText",
+                "parameters": [
+                    { "name": "styleSheetId", "$ref": "StyleSheetId" },
+                    { "name": "range", "$ref": "SourceRange", "description": "Source range to be replaced in stylesheet text." },
+                    { "name": "text", "type": "string", "description": "Text that will replace given range in the stylesheet text." }
+                ],
+                "returns": [
+                    { "name": "rule", "$ref": "CSSRule", "optional": true, "description": "The resulting rule after the selector modification." },
+                    { "name": "style", "$ref": "CSSStyle", "optional": true, "description": "The updated style which the editing was scoped to." }
+                ],
+                "description": "Replace stylesheet text range with a new text. This will invalidate all existing <code>CSSStyleId</code>s and <code>CSSRuleId</code>s contained by this stylesheet."
             },
             {
                 "name": "setPropertyText",
                 "parameters": [
                     { "name": "styleId", "$ref": "CSSStyleId" },
                     { "name": "propertyIndex", "type": "integer" },
                     { "name": "text", "type": "string" },
                     { "name": "overwrite", "type": "boolean" }
                 ],
                 "returns": [
@@ skipping 1405 matching lines @@
             {
                 "name": "dataAvailable",
                 "parameters": [
                     {"name": "value", "type": "array", "items": { "$ref": "PowerEvent" }, "description": "List of power events." }
                 ],
                 "handlers": ["browser", "frontend"]
             }
         ]
     }]
 }