Add a Rappor option in the settings page.

chrome/browser/metrics/metrics_services_manager.h

Index: chrome/browser/metrics/metrics_services_manager.h
diff --git a/chrome/browser/metrics/metrics_services_manager.h b/chrome/browser/metrics/metrics_services_manager.h
index b0f2670bacc9ed9fb3002c2f99fb914b95b4dc17..5e78932736690f94fb67694a1bdbf049f1d2a562 100644
--- a/chrome/browser/metrics/metrics_services_manager.h
+++ b/chrome/browser/metrics/metrics_services_manager.h
@@ -8,6 +8,7 @@
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/threading/thread_checker.h"
+#include "components/rappor/rappor_service.h"
 
 class ChromeMetricsServiceClient;
 class PrefService;
@@ -58,6 +59,12 @@ class MetricsServicesManager {
   // Returns true iff metrics reporting is enabled.
   bool IsMetricsReportingEnabled() const;
 
+  // Returns true iff Rappor reporting is enabled.
+  bool IsRapporEnabled(bool metrics_enabled) const;
+
+  // Returns the recording level for Rappor metrics.
+  rappor::RecordingLevel GetRapporRecordingLevel(bool metrics_enabled) const;
+
  private:
   // Returns the ChromeMetricsServiceClient, creating it if it hasn't been
   // created yet (and additionally creating the MetricsService in that case).