WIP: The tracing service prototype

content/public/app/mojo/content_utility_manifest.json

 {
   "name": "content_utility",
   "display_name": "Content (utility process)",
   "interface_provider_specs": {
     "service_manager:connector": {
       "provides": {
         "browser": [
           "content::mojom::Child",
           "IPC::mojom::ChannelBootstrap",
           "service_manager::mojom::ServiceFactory"
         ],
         "service_manager:service_factory": [
           "service_manager::mojom::ServiceFactory"
         ]
       },
       "requires": {
+        "*": [ "app" ],
         "content_browser": [ "utility" ],
         "device": [
           "device:power_monitor",
           "device:time_zone_monitor"
         ]
       }
     }
   },
   "required_files" : {
     "v8_natives_data" : [
@@ skipping 13 matching lines @@
     "v8_snapshot_32_data" : [{
       "path": "assets/snapshot_blob_32.bin",
       "platform": "android"
     }],
     "v8_snapshot_64_data" : [{
       "path": "assets/snapshot_blob_64.bin",
       "platform": "android"
     }]
   }
 }