[Storage] Blob items are now shared between blobs. Ready for disk swap.

storage/browser/blob/internal_blob_data.cc

+// TODO: Insert description here. (generated by dmurph)
+
+#include "storage/browser/blob/internal_blob_data.h"
+
+#include "base/containers/hash_tables.h"
+#include "base/metrics/histogram.h"
+#include "storage/browser/blob/blob_data_item.h"
+#include "storage/common/data_element.h"
+
+namespace storage {
+namespace {
+size_t GetNonsharedMemoryUsage(
+    const std::vector<scoped_refptr<ShareableBlobDataItem>>& items) {
+  size_t memory = 0;
+  base::hash_set<void*> seen_items;
+  for (const auto& data_item : items) {
+    if (data_item->item()->type() == DataElement::TYPE_BYTES &&
+        data_item->referencing_blobs().size() == 1) {
+      if (seen_items.find(data_item.get()) != seen_items.end()) {
+        continue;
+      }
+      memory += data_item->item()->length();
+      seen_items.insert(data_item.get());
+    }
+  }
+  return memory;
+}
+void RemoveBlobFromShareableItems(
+    const std::string& blob_uuid,
+    std::vector<scoped_refptr<ShareableBlobDataItem>>& items) {
+  for (auto& data_item : items) {
+    data_item->referencing_blobs().erase(blob_uuid);
+  }
+}
+}  // namespace
+
+InternalBlobData::Builder::Builder() {
+}
+InternalBlobData::Builder::~Builder() {
+}
+
+void InternalBlobData::Builder::AppendSharedBlobItem(
+    scoped_refptr<ShareableBlobDataItem> item) {
+  DCHECK(item);
+  items_.push_back(item);
+}
+
+void InternalBlobData::Builder::RemoveBlobFromShareableItems(
+    const std::string& blob_uuid) {
+  ::storage::RemoveBlobFromShareableItems(blob_uuid, items_);
+}
+
+size_t InternalBlobData::Builder::GetNonsharedMemoryUsage() const {
+  return ::storage::GetNonsharedMemoryUsage(items_);
+}
+
+InternalBlobData::InternalBlobData(scoped_ptr<Builder> builder) {
+  content_type_.swap(builder->content_type_);
+  content_disposition_.swap(builder->content_disposition_);
+  items_.swap(builder->items_);
+}
+
+InternalBlobData::~InternalBlobData() {
+}
+
+const std::vector<scoped_refptr<ShareableBlobDataItem>>&
+InternalBlobData::items() const {
+  return items_;
+}
+const std::string& InternalBlobData::content_type() const {
+  return content_type_;
+}
+const std::string& InternalBlobData::content_disposition() const {
+  return content_disposition_;
+}
+
+void InternalBlobData::RemoveBlobFromShareableItems(
+    const std::string& blob_uuid) {
+  ::storage::RemoveBlobFromShareableItems(blob_uuid, items_);
+}
+
+size_t InternalBlobData::GetNonsharedMemoryUsage() const {
+  return ::storage::GetNonsharedMemoryUsage(items_);
+}
+
+}  // namespace storage