Make WebURLLoader capable of retaining received buffers.

content/child/resource_dispatcher.h

Index: content/child/resource_dispatcher.h
diff --git a/content/child/resource_dispatcher.h b/content/child/resource_dispatcher.h
index 769eae2589f2040106bb8dbd6fa17432ff220f3b..b09a0a4a04c4284fa1ea9666d952ab2fb138d71b 100644
--- a/content/child/resource_dispatcher.h
+++ b/content/child/resource_dispatcher.h
@@ -43,6 +43,7 @@ class ThreadedDataProvider;
 struct ResourceResponseInfo;
 struct RequestInfo;
 struct ResourceResponseHead;
+class SharedMemoryReceivedDataFactory;
 struct SiteIsolationResponseMetaData;
 struct SyncLoadResponse;
 
@@ -165,6 +166,7 @@ class CONTENT_EXPORT ResourceDispatcher : public IPC::Listener {
     base::TimeTicks response_start;
     base::TimeTicks completion_time;
     linked_ptr<base::SharedMemory> buffer;
+    scoped_refptr<SharedMemoryReceivedDataFactory> received_data_factory;
     linked_ptr<SiteIsolationResponseMetaData> site_isolation_metadata;
     bool blocked_response;
     int buffer_size;