Add support for reading blobs when using the network service.

storage/browser/blob/blob_url_request_job.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef STORAGE_BROWSER_BLOB_BLOB_URL_REQUEST_JOB_H_
 #define STORAGE_BROWSER_BLOB_BLOB_URL_REQUEST_JOB_H_
 
 #include <stddef.h>
 
 #include <map>
 #include <memory>
 #include <vector>
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "net/http/http_byte_range.h"
 #include "net/http/http_status_code.h"
 #include "net/url_request/url_request_job.h"
 #include "storage/browser/blob/blob_reader.h"
 #include "storage/browser/storage_browser_export.h"
 
 namespace base {
 class SingleThreadTaskRunner;
 }
 
 namespace net {
+class HttpResponseHeaders;
 class IOBuffer;
 }
 
 namespace storage {
 
 class BlobDataHandle;
 class FileStreamReader;
 class FileSystemContext;
 
 // A request job that handles reading blob URLs.
 class STORAGE_EXPORT BlobURLRequestJob
     : public net::URLRequestJob {
  public:
   BlobURLRequestJob(net::URLRequest* request,
                     net::NetworkDelegate* network_delegate,
                     BlobDataHandle* blob_handle,
                     storage::FileSystemContext* file_system_context,
                     base::SingleThreadTaskRunner* resolving_thread_task_runner);
 
   // net::URLRequestJob methods.
   void Start() override;
   void Kill() override;
   int ReadRawData(net::IOBuffer* buf, int buf_size) override;
   bool GetMimeType(std::string* mime_type) const override;
   void GetResponseInfo(net::HttpResponseInfo* info) override;
   void SetExtraRequestHeaders(const net::HttpRequestHeaders& headers) override;
 
+  // Helper method to create the HTTP headers for the response.
+  static scoped_refptr<net::HttpResponseHeaders> GenerateHeaders(
+      net::HttpStatusCode status_code,
+      BlobDataHandle* blob_handle,
+      BlobReader* blob_reader,
+      net::HttpByteRange* byte_range,
+      int64_t* content_size);
+
  protected:
   ~BlobURLRequestJob() override;
 
  private:
   typedef std::map<size_t, FileStreamReader*> IndexToReaderMap;
 
   // For preparing for read: get the size, apply the range and perform seek.
   void DidStart();
   void DidCalculateSize(int result);
   void DidReadMetadata(BlobReader::Status result);
@@ skipping 13 matching lines @@
   std::unique_ptr<net::HttpResponseInfo> response_info_;
 
   base::WeakPtrFactory<BlobURLRequestJob> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(BlobURLRequestJob);
 };
 
 }  // namespace storage
 
 #endif  // STORAGE_BROWSER_BLOB_BLOB_URL_REQUEST_JOB_H_