Create the BackgroundFetchBatchManager and initiate a download.

content/browser/background_fetch/background_fetch_context.h

Index: content/browser/background_fetch/background_fetch_context.h
diff --git a/content/browser/background_fetch/background_fetch_context.h b/content/browser/background_fetch/background_fetch_context.h
index 4fdbb4035112e473c82bbf9054874f87b703c226..eb3a146688c3bc1085cfee5995e1d6951ac84485 100644
--- a/content/browser/background_fetch/background_fetch_context.h
+++ b/content/browser/background_fetch/background_fetch_context.h
@@ -7,11 +7,13 @@
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
+#include "content/browser/background_fetch/background_fetch_batch_manager.h"
 #include "content/browser/background_fetch/background_fetch_data_manager.h"
 #include "content/common/content_export.h"
 
 namespace content {
 
+class BatchRequest;
 class BrowserContext;
 class FetchRequest;
 class ServiceWorkerContextWrapper;
@@ -27,6 +29,7 @@ class CONTENT_EXPORT BackgroundFetchContext
   // that it can respond to service worker events such as unregister.
   BackgroundFetchContext(
       BrowserContext* browser_context,
+      StoragePartition* storage_partition,
       const scoped_refptr<ServiceWorkerContextWrapper>& context);
 
   // Init and Shutdown are for use on the UI thread when the StoragePartition is
@@ -41,12 +44,15 @@ class CONTENT_EXPORT BackgroundFetchContext
   }
 
  private:
-  void CreateRequest(const FetchRequest& fetch_request);
+  void CreateRequest(const BatchRequest& batch_request,
+                     const std::vector<FetchRequest>& fetch_requests);
 
   friend class base::RefCountedThreadSafe<BackgroundFetchContext>;
   ~BackgroundFetchContext();
 
+  BrowserContext* browser_context_;
   scoped_refptr<ServiceWorkerContextWrapper> service_worker_context_;
+  BackgroundFetchBatchManager background_fetch_batch_manager_;
   BackgroundFetchDataManager background_fetch_data_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(BackgroundFetchContext);