[BlobAsync] Disk support for blob storage

storage/browser/blob/shareable_blob_data_item.cc

Index: storage/browser/blob/shareable_blob_data_item.cc
diff --git a/storage/browser/blob/shareable_blob_data_item.cc b/storage/browser/blob/shareable_blob_data_item.cc
index 40aaf9c7e10d29d40acbc73798f67f6c16030b4d..3602106e378c6e6ec79a09c8d6a5a4e3a93db62b 100644
--- a/storage/browser/blob/shareable_blob_data_item.cc
+++ b/storage/browser/blob/shareable_blob_data_item.cc
@@ -7,20 +7,46 @@
 #include "storage/browser/blob/blob_data_item.h"
 
 namespace storage {
+namespace {
 
-ShareableBlobDataItem::ShareableBlobDataItem(
-    const std::string& blob_uuid,
-    const scoped_refptr<BlobDataItem>& item)
-    : item_(item) {
+uint64_t GetAndIncrementItemId() {
+  static uint64_t sNextItemId = 0;
+  return sNextItemId++;
+}
+
+}  // namespace
+
+ShareableBlobDataItem::ShareableBlobDataItem(scoped_refptr<BlobDataItem> item)
+    : item_id_(GetAndIncrementItemId()), item_(std::move(item)) {
   DCHECK_NE(item_->type(), DataElement::TYPE_BLOB);
-  referencing_blobs_.insert(blob_uuid);
 }
 
 ShareableBlobDataItem::~ShareableBlobDataItem() {
 }
 
-const scoped_refptr<BlobDataItem>& ShareableBlobDataItem::item() {
+const scoped_refptr<BlobDataItem>& ShareableBlobDataItem::item() const {
   return item_;
 }
 
+void PrintTo(const ShareableBlobDataItem& x, ::std::ostream* os) {
+  *os << "<ShareableBlobDataItem>{ item_id: " << x.item_id_ << ", item: ";
+  PrintTo(*x.item_, os);
+  *os << ", referencing_blobs: [";
+  for (const std::string& uuid : x.referencing_blobs_) {
+    *os << uuid << ", ";
+  }
+  *os << "]}";
+}
+
+bool operator==(const ShareableBlobDataItem& a,
+                const ShareableBlobDataItem& b) {
+  return a.item_id() == b.item_id() && *a.item() == *b.item() &&
+         a.referencing_blobs() == b.referencing_blobs();
+}
+
+bool operator!=(const ShareableBlobDataItem& a,
+                const ShareableBlobDataItem& b) {
+  return !(a == b);
+}
+
 }  // namespace storage