Basic UkmService implementation

components/metrics/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_METRICS_SERVICE_CLIENT_H_
 #define COMPONENTS_METRICS_METRICS_SERVICE_CLIENT_H_
 
 #include <stdint.h>
 
 #include <memory>
 #include <string>
 
 #include "base/callback_forward.h"
 #include "base/strings/string16.h"
 #include "base/time/time.h"
 #include "components/metrics/metrics_reporting_default_state.h"
 #include "components/metrics/proto/system_profile.pb.h"
 
 namespace base {
 class FilePath;
 }
 
+namespace ukm {
+class UkmService;
+}
+
 namespace metrics {
 
 class MetricsLogUploader;
 class MetricsService;
 
 // An abstraction of operations that depend on the embedder's (e.g. Chrome)
 // environment.
 class MetricsServiceClient {
  public:
   virtual ~MetricsServiceClient() {}
 
   // Returns the MetricsService instance that this client is associated with.
   // With the exception of testing contexts, the returned instance must be valid
   // for the lifetime of this object (typically, the embedder's client
   // implementation will own the MetricsService instance being returned).
   virtual MetricsService* GetMetricsService() = 0;
 
+  // Returns the UkmService instance that this client is associated with.
+  virtual ukm::UkmService* GetUkmService();
+
   // Registers the client id with other services (e.g. crash reporting), called
   // when metrics recording gets enabled.
   virtual void SetMetricsClientId(const std::string& client_id) = 0;
 
   // Returns the product value to use in uploaded reports, which will be used to
   // set the ChromeUserMetricsExtension.product field. See comments on that
   // field on why it's an int32_t rather than an enum.
   virtual int32_t GetProduct() = 0;
 
   // Returns the current application locale (e.g. "en-US").
@@ skipping 64 matching lines @@
   // shown during first-run.
   virtual EnableMetricsDefault GetMetricsReportingDefaultState();
 
   // Returns whether cellular logic is enabled for metrics reporting.
   virtual bool IsUMACellularUploadLogicEnabled();
 };
 
 }  // namespace metrics
 
 #endif  // COMPONENTS_METRICS_METRICS_SERVICE_CLIENT_H_