DevTools: CSS.getPlatformFontsForNode to return a cssFamilyName as well

Source/devtools/protocol.json

Index: Source/devtools/protocol.json
diff --git a/Source/devtools/protocol.json b/Source/devtools/protocol.json
index 6f152779bc7f9a920186f0c3a0e3340fe1c06422..b8e7ad7c813c441d2e5785cf3e281399f4734d6e 100644
--- a/Source/devtools/protocol.json
+++ b/Source/devtools/protocol.json
@@ -2525,6 +2525,7 @@
                     { "name": "nodeId", "$ref": "DOM.NodeId" }
                 ],
                 "returns": [
+                    { "name": "cssFamilyName", "type": "string", "description": "Font family name which is determined by computed style." },
                     { "name": "fonts", "type": "array", "items": { "$ref": "PlatformFontUsage"}, "description": "Usage statistics for every employed platform font." }
                 ],
                 "description": "Requests information about platform fonts which we used to render child TextNodes in the given node.",