Move tracing_impl code to mojo/common

sky/viewer/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//mojo/public/mojo_application.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
 
 mojo_native_application("viewer") {
   output_name = "sky_viewer"
 
   sources = [
     "content_handler_impl.cc",
     "content_handler_impl.h",
     "converters/basic_types.cc",
     "converters/basic_types.h",
     "converters/input_event_types.cc",
     "converters/input_event_types.h",
     "converters/url_request_types.cc",
     "converters/url_request_types.h",
     "document_view.cc",
     "document_view.h",
     "internals.cc",
     "internals.h",
     "platform/platform_impl.cc",
     "platform/platform_impl.h",
     "platform/weburlloader_impl.cc",
     "platform/weburlloader_impl.h",
     "script/script_runner.cc",
     "script/script_runner.h",
-    "services/tracing_impl.cc",
-    "services/tracing_impl.h",
     "services/inspector_impl.cc",
     "services/inspector_impl.h",
     "viewer.cc",
   ]
 
   include_dirs = [ ".." ]
 
   deps = [
     ":bindings",
     ":sky_modules",
     "//base:i18n",
     "//gin",
     "//mojo/application",
     "//mojo/common",
+    "//mojo/common:tracing_impl",
     "//mojo/converters/geometry",
     "//mojo/converters/surfaces",
     "//mojo/edk/js",
     "//mojo/public/c/system:for_shared_library",
     "//mojo/public/cpp/bindings",
     "//mojo/public/cpp/system",
     "//mojo/public/cpp/utility",
     "//mojo/public/interfaces/application",
     "//mojo/services/public/cpp/view_manager",
     "//mojo/services/public/interfaces/content_handler",
@@ skipping 10 matching lines @@
     "//sky/services/inspector:bindings",
     "//sky/services/testing:bindings",
     "//third_party/icu",
     "//ui/native_theme",
     "//url",
   ]
 }
 
 mojom("bindings") {
   sources = [
-    "services/tracing.mojom",
     "services/inspector.mojom",
   ]
 }
 
 copy("sky_modules") {
   sources = [
     "script/core.sky",
     "script/support.sky",
   ]
   outputs = [
     "$root_gen_dir/mojo/public/sky/{{source_file_part}}",
   ]
 }