[Offline Pages] Define separate watchdog timeout for concurrent bg loads

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 83abd4a4e058b9d082400353a7cbbbf248a29d04..05b03e7e6850be7c189a245390b6194eccaa614c 100644
--- a/components/offline_pages/background/offliner_policy.h
+++ b/components/offline_pages/background/offliner_policy.h
@@ -9,7 +9,8 @@ namespace {
 const int kMaxStartedTries = 4;
 const int kMaxCompletedTries = 1;
 const int kBackgroundProcessingTimeBudgetSeconds = 170;
-const int kSinglePageTimeLimitSeconds = 120;
+const int kSinglePageTimeLimitWhenBackgroundScheduledSeconds = 120;
+const int kSinglePageTimeLimitForImmediateLoadSeconds = 300;
 const int kRequestExpirationTimeInSeconds = 60 * 60 * 24 * 7;
 }  // namespace
 
@@ -86,9 +87,16 @@ class OfflinerPolicy {
     return kBackgroundProcessingTimeBudgetSeconds;
   }
 
-  // How long do we allow a page to load before giving up on it
-  int GetSinglePageTimeLimitInSeconds() const {
-    return kSinglePageTimeLimitSeconds;
+  // How long do we allow a page to load before giving up on it when
+  // background loading was scheduled.
+  int GetSinglePageTimeLimitWhenBackgroundScheduledInSeconds() const {
+    return kSinglePageTimeLimitWhenBackgroundScheduledSeconds;
+  }
+
+  // How long do we allow a page to load before giving up on it when
+  // immediately background loading.
+  int GetSinglePageTimeLimitForImmediateLoadInSeconds() const {
+    return kSinglePageTimeLimitForImmediateLoadSeconds;
   }
 
   // How long we allow requests to remain in the system before giving up.