[Offline Pages] Add evaluation test support in RequestCoordinator.

components/offline_pages/background/offliner_policy.h

Index: components/offline_pages/background/offliner_policy.h
diff --git a/components/offline_pages/background/offliner_policy.h b/components/offline_pages/background/offliner_policy.h
index a82f5e68715a150a86a1dd4ec4d1f1b7755bd974..d3424f39eb7a7b53e568fb8b75789655a990a8dc 100644
--- a/components/offline_pages/background/offliner_policy.h
+++ b/components/offline_pages/background/offliner_policy.h
@@ -8,7 +8,7 @@
 namespace {
 const int kMaxStartedTries = 4;
 const int kMaxCompletedTries = 1;
-const int kBackgroundProcessingTimeBudgetSeconds = 170;
+const int kDefaultBackgroundProcessingTimeBudgetSeconds = 170;
 const int kSinglePageTimeLimitWhenBackgroundScheduledSeconds = 120;
 const int kSinglePageTimeLimitForImmediateLoadSeconds = 300;
 const int kRequestExpirationTimeInSeconds = 60 * 60 * 24 * 7;
@@ -25,19 +25,23 @@ class OfflinerPolicy {
         prefer_earlier_requests_(true),
         retry_count_is_more_important_than_recency_(false),
         max_started_tries_(kMaxStartedTries),
-        max_completed_tries_(kMaxCompletedTries) {}
+        max_completed_tries_(kMaxCompletedTries),
+        background_processing_time_budget_(
+            kDefaultBackgroundProcessingTimeBudgetSeconds) {}
 
   // Constructor for unit tests.
   OfflinerPolicy(bool prefer_untried,
                  bool prefer_earlier,
                  bool prefer_retry_count,
                  int max_started_tries,
-                 int max_completed_tries)
+                 int max_completed_tries,
+                 int background_processing_time_budget)
       : prefer_untried_requests_(prefer_untried),
         prefer_earlier_requests_(prefer_earlier),
         retry_count_is_more_important_than_recency_(prefer_retry_count),
         max_started_tries_(max_started_tries),
-        max_completed_tries_(max_completed_tries) {}
+        max_completed_tries_(max_completed_tries),
+        background_processing_time_budget_(background_processing_time_budget) {}
 
   // TODO(petewil): Numbers here are chosen arbitrarily, do the proper studies
   // to get good policy numbers. Eventually this should get data from a finch
@@ -84,7 +88,7 @@ class OfflinerPolicy {
   // How many seconds to keep trying new pages for, before we give up,  and
   // return to the scheduler.
   int GetBackgroundProcessingTimeBudgetSeconds() const {
-    return kBackgroundProcessingTimeBudgetSeconds;
+    return background_processing_time_budget_;
   }
 
   // How long do we allow a page to load before giving up on it when
@@ -110,6 +114,7 @@ class OfflinerPolicy {
   bool retry_count_is_more_important_than_recency_;
   int max_started_tries_;
   int max_completed_tries_;
+  int background_processing_time_budget_;
 };
 }  // namespace offline_pages