[BlobStorage] BlobMemoryController & tests

storage/browser/blob/blob_data_item.h

Index: storage/browser/blob/blob_data_item.h
diff --git a/storage/browser/blob/blob_data_item.h b/storage/browser/blob/blob_data_item.h
index a711a4caf3b3fe4bc969be9e63c87bb33aa79834..0316d871eac32c7ac159d1d56d91b181cad81e81 100644
--- a/storage/browser/blob/blob_data_item.h
+++ b/storage/browser/blob/blob_data_item.h
@@ -28,7 +28,8 @@ class BlobStorageContext;
 // this class is to allow the resource to stick around in the snapshot even
 // after the resource was swapped in the blob (either to disk or to memory) by
 // the BlobStorageContext.
-class STORAGE_EXPORT BlobDataItem : public base::RefCounted<BlobDataItem> {
+class STORAGE_EXPORT BlobDataItem
+    : public base::RefCountedThreadSafe<BlobDataItem> {
  public:
   // The DataHandle class is used to persist resources that are needed for
   // reading this BlobDataItem. This object will stay around while any reads are
@@ -43,6 +44,15 @@ class STORAGE_EXPORT BlobDataItem : public base::RefCounted<BlobDataItem> {
     friend class base::RefCounted<DataHandle>;
   };
 
+  explicit BlobDataItem(std::unique_ptr<DataElement> item);
+  BlobDataItem(std::unique_ptr<DataElement> item,
+               const scoped_refptr<DataHandle>& data_handle);
+  BlobDataItem(std::unique_ptr<DataElement> item,
+               const scoped_refptr<DataHandle>& data_handle,
+               disk_cache::Entry* entry,
+               int disk_cache_stream_index,
+               int disk_cache_side_stream_index);
+
   DataElement::Type type() const { return item_->type(); }
   const char* bytes() const { return item_->bytes(); }
   const base::FilePath& path() const { return item_->path(); }
@@ -63,20 +73,14 @@ class STORAGE_EXPORT BlobDataItem : public base::RefCounted<BlobDataItem> {
     return disk_cache_side_stream_index_;
   }
 
+  const scoped_refptr<DataHandle>& data_handle() const { return data_handle_; }
+
  private:
   friend class BlobDataBuilder;
   friend class BlobStorageContext;
-  friend class base::RefCounted<BlobDataItem>;
+  friend class base::RefCountedThreadSafe<BlobDataItem>;
   friend STORAGE_EXPORT void PrintTo(const BlobDataItem& x, ::std::ostream* os);
 
-  explicit BlobDataItem(std::unique_ptr<DataElement> item);
-  BlobDataItem(std::unique_ptr<DataElement> item,
-               const scoped_refptr<DataHandle>& data_handle);
-  BlobDataItem(std::unique_ptr<DataElement> item,
-               const scoped_refptr<DataHandle>& data_handle,
-               disk_cache::Entry* entry,
-               int disk_cache_stream_index,
-               int disk_cache_side_stream_index);
   virtual ~BlobDataItem();
 
   std::unique_ptr<DataElement> item_;