devtools: Make it possible to override the navigation referrer

third_party/WebKit/Source/core/inspector/browser_protocol.json

 {
     "version": { "major": "1", "minor": "2" },
     "domains": [{
         "domain": "Inspector",
         "experimental": true,
         "types": [],
         "commands": [
             {
                 "name": "enable",
                 "description": "Enables inspector domain notifications."
@@ skipping 233 matching lines @@
                 "name": "reload",
                 "parameters": [
                     { "name": "ignoreCache", "type": "boolean", "optional": true, "description": "If true, browser cache is ignored (as if the user pressed Shift+refresh)." },
                     { "name": "scriptToEvaluateOnLoad", "type": "string", "optional": true, "description": "If set, the script will be injected into all frames of the inspected page after reload." }
                 ],
                 "description": "Reloads given page optionally ignoring the cache."
             },
             {
                 "name": "navigate",
                 "parameters": [
-                    { "name": "url", "type": "string", "description": "URL to navigate the page to." }
+                    { "name": "url", "type": "string", "description": "URL to navigate the page to." },
+                    { "name": "referrer", "type": "string", "optional": true, "experimental": true, "description": "Referrer URL." }
                 ],
                 "returns": [
                     { "name": "frameId", "$ref": "FrameId", "experimental": true, "description": "Frame id that will be navigated." }
                 ],
                 "description": "Navigates current page to the given URL."
             },
             {
                 "name": "stopLoading",
                 "description": "Force the page stop all navigations and pending resource fetches.",
                 "experimental": true
@@ skipping 4284 matching lines @@
                 "name": "accepted",
                 "description": "Informs that port was successfully bound and got a specified connection id.",
                 "parameters": [
                     {"name": "port", "type": "integer", "description": "Port number that was successfully bound." },
                     {"name": "connectionId", "type": "string", "description": "Connection id to be used." }
                 ]
             }
         ]
     }]
 }