[Offline Pages] Defines longer processing budget for immediate bg loads.

components/offline_pages/background/request_coordinator.h

Index: components/offline_pages/background/request_coordinator.h
diff --git a/components/offline_pages/background/request_coordinator.h b/components/offline_pages/background/request_coordinator.h
index 8ab2385f1801e4729ad97a497100e1820784636c..263128f7edded1671f78c11e0b2cd76e7eb5b9f4 100644
--- a/components/offline_pages/background/request_coordinator.h
+++ b/components/offline_pages/background/request_coordinator.h
@@ -145,6 +145,8 @@ class RequestCoordinator : public KeyedService,
     immediate_schedule_callback_ = callback;
   }
 
+  void StartImmediatelyForTest() { StartImmediatelyIfConnected(); }
+
   // Observers implementing the RequestCoordinator::Observer interface can
   // register here to get notifications of changes to request state.  This
   // pointer is not owned, and it is the callers responsibility to remove the
@@ -339,6 +341,9 @@ class RequestCoordinator : public KeyedService,
 
   friend class RequestCoordinatorTest;
 
+  // Cached value of whether low end device. Overwritable for testing.
+  bool is_low_end_device_;
+
   // The offliner can only handle one request at a time - if the offliner is
   // busy, prevent other requests.  This flag marks whether the offliner is in
   // use.