Domain Reliability: Add sample_rate field to Beacon

components/domain_reliability/config.cc

Index: components/domain_reliability/config.cc
diff --git a/components/domain_reliability/config.cc b/components/domain_reliability/config.cc
index 46fa53aa069e9dd5a696f816a9b3d2136c87f236..c76644b58a4ca05bcbf1417c514c83aaeb20c1f0 100644
--- a/components/domain_reliability/config.cc
+++ b/components/domain_reliability/config.cc
@@ -14,7 +14,6 @@
 #include "base/json/json_reader.h"
 #include "base/json/json_value_converter.h"
 #include "base/profiler/scoped_tracker.h"
-#include "base/rand_util.h"
 #include "base/strings/pattern.h"
 #include "base/strings/string_util.h"
 
@@ -77,9 +76,8 @@ bool DomainReliabilityConfig::IsValid() const {
   return true;
 }
 
-bool DomainReliabilityConfig::DecideIfShouldReportRequest(bool success) const {
-  double sample_rate = success ? success_sample_rate : failure_sample_rate;
-  return base::RandDouble() < sample_rate;
+double DomainReliabilityConfig::GetSampleRate(bool success) const {
+  return success ? success_sample_rate : failure_sample_rate;
 }
 
 // static