hook up background task's "startProcessing" from Java to request_coordinator

components/offline_pages/background/request_coordinator.cc

Index: components/offline_pages/background/request_coordinator.cc
diff --git a/components/offline_pages/background/request_coordinator.cc b/components/offline_pages/background/request_coordinator.cc
index 3481218caf43d8f77796d78ebf46eb9522924a1b..0a0ebdb23c01345f3a6a8547ce4dd4213c6f98de 100644
--- a/components/offline_pages/background/request_coordinator.cc
+++ b/components/offline_pages/background/request_coordinator.cc
@@ -69,6 +69,11 @@ void RequestCoordinator::AddRequestResultCallback(
 }
 
 void RequestCoordinator::RequestPicked(const SavePageRequest& request) {
+  Scheduler::TriggerCondition conditions;
+
+  // Ensure that the scheduler has actively scheduled a task.
+  scheduler_->Schedule(conditions);
+
   // Send the request on to the offliner.
   SendRequestToOffliner(request);
 }