Revert of Revert of Domain Reliability: Switch to BackoffEntry in Scheduler

components/domain_reliability/util.h

Index: components/domain_reliability/util.h
diff --git a/components/domain_reliability/util.h b/components/domain_reliability/util.h
index 80699d437907bb18a0b7f96d846d2e30daf62578..56ca229875158d2995397e259e3a8779966b2421 100644
--- a/components/domain_reliability/util.h
+++ b/components/domain_reliability/util.h
@@ -13,6 +13,7 @@
 #include "base/time/time.h"
 #include "base/tracked_objects.h"
 #include "components/domain_reliability/domain_reliability_export.h"
+#include "net/base/backoff_entry.h"
 #include "net/http/http_response_info.h"
 
 namespace domain_reliability {
@@ -82,6 +83,21 @@
   scoped_ptr<MockableTime::Timer> CreateTimer() override;
 };
 
+// A subclass of BackoffEntry that uses a MockableTime to keep track of time.
+class MockableTimeBackoffEntry : public net::BackoffEntry {
+ public:
+  MockableTimeBackoffEntry(const net::BackoffEntry::Policy* const policy,
+                           MockableTime* time);
+
+  virtual ~MockableTimeBackoffEntry();
+
+ protected:
+  virtual base::TimeTicks ImplGetTimeNow() const override;
+
+ private:
+  MockableTime* time_;
+};
+
 }  // namespace domain_reliability
 
 #endif  // COMPONENTS_DOMAIN_RELIABILITY_UTIL_H_