[BlobAsync] Patch 2: Common Constants

storage/browser/blob/blob_data_item.h

 // Copyright (c) 2015 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_DATA_ITEM_H_
 #define STORAGE_BROWSER_BLOB_BLOB_DATA_ITEM_H_
 
+#include <ostream>
+
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
 #include "storage/browser/storage_browser_export.h"
 #include "storage/common/data_element.h"
 
 namespace disk_cache {
 class Entry;
 }
 
 namespace storage {
@@ skipping 25 matching lines @@
   const base::FilePath& path() const { return item_->path(); }
   const GURL& filesystem_url() const { return item_->filesystem_url(); }
   const std::string& blob_uuid() const { return item_->blob_uuid(); }
   uint64 offset() const { return item_->offset(); }
   uint64 length() const { return item_->length(); }
   const base::Time& expected_modification_time() const {
     return item_->expected_modification_time();
   }
   const DataElement& data_element() const { return *item_; }
   const DataElement* data_element_ptr() const { return item_.get(); }
+  DataElement* data_element_ptr() { return item_.get(); }
 
   disk_cache::Entry* disk_cache_entry() const { return disk_cache_entry_; }
   int disk_cache_stream_index() const { return disk_cache_stream_index_; }
 
  private:
   friend class BlobDataBuilder;
   friend class BlobStorageContext;
   friend class base::RefCounted<BlobDataItem>;
+  friend std::ostream& operator<<(std::ostream& os, const BlobDataItem& x);
 
   BlobDataItem(scoped_ptr<DataElement> item);
   BlobDataItem(scoped_ptr<DataElement> item,
                const scoped_refptr<DataHandle>& data_handle);
   BlobDataItem(scoped_ptr<DataElement> item,
                const scoped_refptr<DataHandle>& data_handle,
                disk_cache::Entry* entry,
                int disk_cache_stream_index_);
   virtual ~BlobDataItem();
 
   scoped_ptr<DataElement> item_;
   scoped_refptr<DataHandle> data_handle_;
 
   // This naked pointer is safe because the scope is protected by the DataHandle
   // instance for disk cache entries during the lifetime of this BlobDataItem.
   disk_cache::Entry* disk_cache_entry_;
   int disk_cache_stream_index_;  // For TYPE_DISK_CACHE_ENTRY.
 };
 
+STORAGE_EXPORT std::ostream& operator<<(std::ostream& os,
+                                        const BlobDataItem& x);
+
 #if defined(UNIT_TEST)
 inline bool operator==(const BlobDataItem& a, const BlobDataItem& b) {
   return a.disk_cache_entry() == b.disk_cache_entry() &&
          a.disk_cache_stream_index() == b.disk_cache_stream_index() &&
          a.data_element() == b.data_element();
 }
 
 inline bool operator!=(const BlobDataItem& a, const BlobDataItem& b) {
   return !(a == b);
 }
 #endif  // defined(UNIT_TEST)
 
 }  // namespace storage
 
 #endif  // STORAGE_BROWSER_BLOB_BLOB_DATA_ITEM_H_