[DevTools] Shows Manifest file in Sources tab

third_party/WebKit/Source/devtools/protocol.json

 {
     "version": { "major": "1", "minor": "1" },
     "domains": [{
         "domain": "Inspector",
         "hidden": true,
         "types": [],
         "commands": [
             {
                 "name": "enable",
                 "description": "Enables inspector domain notifications.",
@@ skipping 72 matching lines @@
             }
         ]
     },
     {
         "domain": "Page",
         "description": "Actions and events related to the inspected page belong to the page domain.",
         "types": [
             {
                 "id": "ResourceType",
                 "type": "string",
-                "enum": ["Document", "Stylesheet", "Image", "Media", "Font", "Script", "TextTrack", "XHR", "Fetch", "EventSource", "WebSocket", "Other"],
+                "enum": ["Document", "Stylesheet", "Image", "Media", "Font", "Script", "TextTrack", "XHR", "Fetch", "EventSource", "WebSocket", "Manifest", "Other"],
                 "description": "Resource type as it was perceived by the rendering engine."
             },
             {
               "id": "FrameId",
               "type": "string",
               "description": "Unique frame identifier."
             },
             {
                 "id": "Frame",
                 "type": "object",
@@ skipping 5204 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
             }
         ]
     }]
 }