Move the thread hop for UMA user actions from content:: to base::.

components/metrics/test_metrics_service_client.h

 // 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.
 
 #ifndef COMPONENTS_METRICS_TEST_METRICS_SERVICE_CLIENT_H_
 #define COMPONENTS_METRICS_TEST_METRICS_SERVICE_CLIENT_H_
 
 #include <stdint.h>
 
 #include <string>
@@ skipping 22 matching lines @@
   bool GetBrand(std::string* brand_code) override;
   SystemProfileProto::Channel GetChannel() override;
   std::string GetVersionString() override;
   void OnLogUploadComplete() override;
   void InitializeSystemProfileMetrics(
       const base::Closure& done_callback) override;
   void CollectFinalMetricsForLog(const base::Closure& done_callback) override;
   scoped_ptr<MetricsLogUploader> CreateUploader(
       const base::Callback<void(int)>& on_upload_complete) override;
   base::TimeDelta GetStandardUploadInterval() override;
+  scoped_refptr<base::SingleThreadTaskRunner>
+      GetMainThreadTaskRunner() override;
   bool IsReportingPolicyManaged() override;
   MetricsServiceClient::EnableMetricsDefault GetDefaultOptIn() override;
 
+

[Ilya Sherman, 2016/04/07 18:21:54]

nit: Spurious newline.

[beaudoin, 2016/04/07 21:12:58]

Done.

   const std::string& get_client_id() const { return client_id_; }
   void set_version_string(const std::string& str) { version_string_ = str; }
   void set_product(int32_t product) { product_ = product; }
   void set_reporting_is_managed(bool managed) {
     reporting_is_managed_ = managed;
   }
   void set_enable_default(
       MetricsServiceClient::EnableMetricsDefault enable_default) {
     enable_default_ = enable_default;
   }
 
  private:
   std::string client_id_;
   std::string version_string_;
   int32_t product_;
   bool reporting_is_managed_;
   MetricsServiceClient::EnableMetricsDefault enable_default_;
+  scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
 
   DISALLOW_COPY_AND_ASSIGN(TestMetricsServiceClient);
 };
 
 }  // namespace metrics
 
 #endif  // COMPONENTS_METRICS_TEST_METRICS_SERVICE_CLIENT_H_