Attach mixed content status to resource requests when sent to devtools

Source/devtools/protocol.json

 {
     "version": { "major": "1", "minor": "1" },
     "domains": [{
         "domain": "Inspector",
         "hidden": true,
         "types": [],
         "commands": [
             {
                 "name": "enable",
                 "description": "Enables inspector domain notifications.",
@@ skipping 1162 matching lines @@
                 ]
             },
             {
                 "id": "Request",
                 "type": "object",
                 "description": "HTTP request data.",
                 "properties": [
                     { "name": "url", "type": "string", "description": "Request URL." },
                     { "name": "method", "type": "string", "description": "HTTP request method." },
                     { "name": "headers", "$ref": "Headers", "description": "HTTP request headers." },
-                    { "name": "postData", "type": "string", "optional": true, "description": "HTTP POST request data." }
+                    { "name": "postData", "type": "string", "optional": true, "description": "HTTP POST request data." },
+                    { "name": "mixedContentType", "optional": true, "type": "string", "enum": ["blockable", "optionally-blockable", "none"], "description": "The mixed content status of the request, as defined in http://www.w3.org/TR/mixed-content/" }
                 ]
             },
             {
                 "id": "CertificateId",
                 "type": "integer",
                 "description": "An internal certificate ID value."
             },
             {
                 "id": "CertificateSubject",
                 "type": "object",
@@ skipping 3953 matching lines @@
                 ],
                 "returns": [
                     { "name": "accessibilityNode", "$ref": "AXNode", "description": "The <code>Accessibility.AXNode</code> for this DOM node, if it exists.", "optional": true }
                 ],
                 "description": "Fetches the accessibility node for this DOM node, if it exists.",
                 "hidden": true
             }
         ]
     }]
 }