WIP: The tracing service prototype

content/public/app/mojo/content_browser_manifest.json

 {
   "name": "content_browser",
   "display_name": "Content (browser process)",
   "interface_provider_specs": {
     "service_manager:connector": {
       "provides": {
         "gpu": [
           "content::mojom::FieldTrialRecorder",
           "media::mojom::AndroidOverlayProvider",
-          "memory_instrumentation::mojom::Coordinator"
+          "memory_instrumentation::mojom::Coordinator",
+          "resource_coordinator::tracing::mojom::AgentSet"
         ],
         "plugin": [
           "discardable_memory::mojom::DiscardableSharedMemoryManager",
+          "resource_coordinator::tracing::mojom::AgentSet",
           "ui::mojom::Gpu"
         ],
         "renderer": [
           "blink::mojom::BackgroundFetchService",
           "blink::mojom::BackgroundSyncService",
           "blink::mojom::BroadcastChannelProvider",
           "blink::mojom::BudgetService",
           "blink::mojom::Hyphenation",
           "blink::mojom::MimeRegistry",
           "blink::mojom::NotificationService",
           "blink::mojom::OffscreenCanvasProvider",
           "blink::mojom::PermissionService",
           "blink::mojom::WebSocket",
           "content::mojom::FieldTrialRecorder",
           "content::mojom::MemoryCoordinatorHandle",
           "content::mojom::PushMessaging",
           "content::mojom::FrameSinkProvider",
           "content::mojom::ServiceWorkerDispatcherHost",
           "content::mojom::StoragePartitionService",
           "content::mojom::URLLoaderFactory",
           "content::mojom::VideoCaptureHost",
           "content::mojom::WorkerURLLoaderFactoryProvider",
           "device::mojom::GamepadMonitor",
           "discardable_memory::mojom::DiscardableSharedMemoryManager",
           "media::mojom::ImageCapture",
           "memory_coordinator::mojom::MemoryCoordinatorHandle",
           "memory_instrumentation::mojom::Coordinator",
           "metrics::mojom::SingleSampleMetricsProvider",
           "payments::mojom::PaymentManager",
+          "resource_coordinator::tracing::mojom::AgentSet",
           "shape_detection::mojom::BarcodeDetection",
           "shape_detection::mojom::FaceDetectionProvider",
           "shape_detection::mojom::TextDetection",
           "ui::mojom::Gpu"
         ],
         "service_manager:service_factory": [
           "service_manager::mojom::ServiceFactory"
         ],
         "utility": [
-          "memory_instrumentation::mojom::Coordinator"
+          "memory_instrumentation::mojom::Coordinator",
+          "resource_coordinator::tracing::mojom::AgentSet"
         ]
       },
       "requires": {
         "*": [ "app" ],
         // In classic ash, the browser supplies ash interfaces to itself.
         "content_browser": [ "ash" ],
         "content_gpu": [ "browser" ],
         "content_plugin": [ "browser" ],
         "content_renderer": [ "browser" ],
         "content_utility": [ "browser" ],
         "data_decoder": [ "image_decoder" ],
         "device": [ "device:wake_lock" ],
         "file": [ "file:filesystem", "file:leveldb" ],
         "media": [ "media:media" ],
         "network": [
           "test",
           "url_loader"
         ],
         "ui": [ "display_output_protection" ],
         "service_manager": [
           "service_manager:client_process",
           "service_manager:instance_name",
           "service_manager:user_id"
         ],
         "shape_detection": [
           "barcode_detection",
           "face_detection",
           "text_detection"
-        ]
+        ],
+        "tracing": [ "coordinator" ]
       }
     },
     "navigation:frame": {
       "provides": {
         "renderer": [
           // TODO(beng): these belong in //chrome's overlay, but there are some
           // issues with mash browser_tests's manifest config that make this
           // impossible this week. Remove once sky/ken fix this.
           "autofill::mojom::AutofillDriver",
           "autofill::mojom::PasswordManagerDriver",
@@ skipping 19 matching lines @@
           "payments::mojom::PaymentRequest",
           "ui::mojom::Gpu"
         ]
       },
       "requires": {
         "content_renderer": [ "browser" ]
       }
     }
   }
 }