[GRC] UKM Support

components/ukm/public/mojo_ukm_recorder.h

 // Copyright 2017 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_UKM_PUBLIC_MOJO_UKM_RECORDER_H_
 #define COMPONENTS_UKM_PUBLIC_MOJO_UKM_RECORDER_H_
 
 #include "components/ukm/public/interfaces/ukm_interface.mojom.h"
+#include "components/ukm/public/ukm_export.h"
 #include "components/ukm/public/ukm_recorder.h"
 
 namespace ukm {
 
 /**
  * A helper wrapper that lets UKM data be recorded on other processes with the
  * same interface that is used in the browser process.
  *
  * Usage Example:
  *
  *  ukm::mojom::UkmRecorderInterfacePtr interface;
  *  content::RenderThread::Get()->GetConnector()->BindInterface(
  *      content::mojom::kBrowserServiceName, mojo::MakeRequest(&interface));
  *  ukm::MojoUkmRecorder recorder(std::move(interface));
  *  std::unique_ptr<ukm::UkmEntryBuilder> builder =
  *      recorder.GetEntryBuilder(coordination_unit_id, "MyEvent");
  *  builder->AddMetric("MyMetric", metric_value);
  */
-class MojoUkmRecorder : public UkmRecorder {
+class UKM_EXPORT MojoUkmRecorder : public UkmRecorder {
  public:
-  MojoUkmRecorder(mojom::UkmRecorderInterfacePtr interface);
+  explicit MojoUkmRecorder(mojom::UkmRecorderInterfacePtr interface);
   ~MojoUkmRecorder() override;
 
  private:
   // UkmRecorder:
   void UpdateSourceURL(SourceId source_id, const GURL& url) override;
   void AddEntry(mojom::UkmEntryPtr entry) override;
 
   mojom::UkmRecorderInterfacePtr interface_;
 
   DISALLOW_COPY_AND_ASSIGN(MojoUkmRecorder);
 };
 
 }  // namespace ukm
 
 #endif  // COMPONENTS_UKM_PUBLIC_MOJO_UKM_RECORDER_H_