Create feature and enable data collection for Data Saver site breakdown

components/data_reduction_proxy/core/browser/data_usage_store.cc

Index: components/data_reduction_proxy/core/browser/data_usage_store.cc
diff --git a/components/data_reduction_proxy/core/browser/data_usage_store.cc b/components/data_reduction_proxy/core/browser/data_usage_store.cc
index 98bcbbd0ed433bf750933983259f567349dc910b..fb89dd096a4fd02641f3af48d077004e888aecd8 100644
--- a/components/data_reduction_proxy/core/browser/data_usage_store.cc
+++ b/components/data_reduction_proxy/core/browser/data_usage_store.cc
@@ -22,23 +22,23 @@
 #include "base/time/time.h"
 #include "components/data_reduction_proxy/proto/data_store.pb.h"
 
+namespace data_reduction_proxy {
+
 namespace {
+
 const char kCurrentBucketIndexKey[] = "current_bucket_index";
 const char kBucketKeyPrefix[] = "data_usage_bucket:";
 
 const int kMinutesInHour = 60;
 const int kMinutesInDay = 24 * kMinutesInHour;
 
-// Time interval for each DataUsageBucket.
-const int kDataUsageBucketLengthInMinutes = 15;
-static_assert(kDataUsageBucketLengthInMinutes > 0,
+static_assert(data_reduction_proxy::kDataUsageBucketLengthInMinutes > 0,
               "Length of time should be positive");
-static_assert(kMinutesInHour % kDataUsageBucketLengthInMinutes == 0,
+static_assert(kMinutesInHour %
+                      data_reduction_proxy::kDataUsageBucketLengthInMinutes ==
+                  0,
               "kDataUsageBucketLengthMins must be a factor of kMinsInHour");
 
-// Number of days for which to maintain data usage history.
-const int kDataUsageHistoryNumDays = 60;
-
 // Total number of buckets persisted to DB.
 const int kNumDataUsageBuckets =
     kDataUsageHistoryNumDays * kMinutesInDay / kDataUsageBucketLengthInMinutes;
@@ -65,8 +65,6 @@ base::Time BucketLowerBoundary(base::Time time) {
 
 }  // namespace
 
-namespace data_reduction_proxy {
-
 DataUsageStore::DataUsageStore(DataStore* db)
     : db_(db), current_bucket_index_(-1) {
   sequence_checker_.DetachFromSequence();