mandoline: write this after lunch.

components/font_service/font_service_app.h

 // Copyright 2015 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.
 
 #ifndef COMPONENTS_FONT_SERVICE_FONT_SERVICE_APP_H_
 #define COMPONENTS_FONT_SERVICE_FONT_SERVICE_APP_H_
 
 #include "components/font_service/public/interfaces/font_service.mojom.h"
 #include "mojo/application/public/cpp/application_delegate.h"
 #include "mojo/application/public/cpp/interface_factory.h"
 #include "mojo/common/weak_binding_set.h"
+#include "mojo/services/tracing/public/cpp/tracing_impl.h"
 #include "skia/ext/skia_utils_base.h"
 
 namespace font_service {
 
 class FontServiceApp : public mojo::ApplicationDelegate,
                        public mojo::InterfaceFactory<FontService>,
                        public FontService {
  public:
   FontServiceApp();
   ~FontServiceApp() override;
@@ skipping 12 matching lines @@
   void MatchFamilyName(const mojo::String& family_name,
                        TypefaceStyle requested_style,
                        const MatchFamilyNameCallback& callback) override;
   void OpenStream(uint32_t id_number,
                   const OpenStreamCallback& callback) override;
 
   int FindOrAddPath(const SkString& path);
 
   mojo::WeakBindingSet<FontService> bindings_;
 
+  mojo::TracingImpl tracing_;
+
   // We don't want to leak paths to our callers; we thus enumerate the paths of
   // fonts.
   SkTDArray<SkString*> paths_;
 
   DISALLOW_COPY_AND_ASSIGN(FontServiceApp);
 };
 
 }  // namespace font_service
 
 #endif  // COMPONENTS_FONT_SERVICE_FONT_SERVICE_APP_H_