Adding reporting of metrics sampling rate.

chrome/browser/metrics/chrome_metrics_services_manager_client.h

Index: chrome/browser/metrics/chrome_metrics_services_manager_client.h
diff --git a/chrome/browser/metrics/chrome_metrics_services_manager_client.h b/chrome/browser/metrics/chrome_metrics_services_manager_client.h
index 51bfe205ad34fa1b82bb5d9aa6963f687102c95b..f0bb7be048e93f297feb2ec581db00c7cecc36ce 100644
--- a/chrome/browser/metrics/chrome_metrics_services_manager_client.h
+++ b/chrome/browser/metrics/chrome_metrics_services_manager_client.h
@@ -20,11 +20,6 @@ class EnabledStateProvider;
 class MetricsStateManager;
 }
 
-// Metrics reporting feature. This feature, along with user consent, controls if
-// recording and reporting are enabled. If the feature is enabled, but no
-// consent is given, then there will be no recording or reporting.
-extern const base::Feature kMetricsReportingFeature;
-
 // Provides a //chrome-specific implementation of MetricsServicesManagerClient.
 class ChromeMetricsServicesManagerClient
     : public metrics_services_manager::MetricsServicesManagerClient {
@@ -32,6 +27,13 @@ class ChromeMetricsServicesManagerClient
   explicit ChromeMetricsServicesManagerClient(PrefService* local_state);
   ~ChromeMetricsServicesManagerClient() override;
 
+  // Determines if this client is eligible to send metrics. If they are, and
+  // there was user consent, then metrics and crashes would be reported.
+  static bool IsClientInSample();
+
+  // Returns the sampling rate that affects this client.
+  static int GetSamplingRatePerMille();
+
  private:
   // This is defined as a member class to get access to
   // ChromeMetricsServiceAccessor through ChromeMetricsServicesManagerClient's