Add tracing service and make the shell+sky_viewer+services talk to it

services/tracing/BUILD.gn

Index: services/tracing/BUILD.gn
diff --git a/sky/services/inspector/BUILD.gn b/services/tracing/BUILD.gn
similarity index 61%
copy from sky/services/inspector/BUILD.gn
copy to services/tracing/BUILD.gn
index 111a13fd12e6df286b20ab00fb79b256a2af88d4..9c068c125b5fa2ce1fad79ab4950bf15ace535c4 100644
--- a/sky/services/inspector/BUILD.gn
+++ b/services/tracing/BUILD.gn
@@ -5,32 +5,23 @@
 import("//mojo/public/mojo_application.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
 
-group("inspector") {
-  deps = [
-    ":sky_inspector_server",
-  ]
-}
-
-mojo_native_application("sky_inspector_server") {
+mojo_native_application("tracing") {
   sources = [
-    "server.cc",
+    "main.cc",
+    "trace_data_sink.cc",
+    "trace_data_sink.h",
   ]
 
   deps = [
+    ":bindings",
     "//base",
     "//mojo/application",
     "//mojo/common",
     "//mojo/public/c/system:for_shared_library",
-    "//mojo/public/cpp/bindings",
-    "//mojo/public/cpp/utility",
-    "//net",
-    "//net:http_server",
-    ":bindings",
+    "//mojo/public/cpp/application",
   ]
 }
 
 mojom("bindings") {
-  sources = [
-    "inspector.mojom",
-  ]
+  sources = [ "tracing.mojom" ]
 }