[BlobAsync] Moving async handling into BlobStorageContext & quota out.

storage/browser/blob/blob_entry.cc

+// Copyright 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.
+
+#include <utility>
+
+#include "base/callback.h"
+#include "base/containers/hash_tables.h"
+#include "base/metrics/histogram.h"
+#include "storage/browser/blob/blob_data_handle.h"
+#include "storage/browser/blob/blob_data_item.h"
+#include "storage/browser/blob/blob_entry.h"
+#include "storage/browser/blob/shareable_blob_data_item.h"
+#include "storage/common/data_element.h"
+
+namespace storage {
+namespace {
+bool IsBytes(DataElement::Type type) {
+  return type == DataElement::TYPE_BYTES ||
+         type == DataElement::TYPE_BYTES_DESCRIPTION;
+}
+}  // namespace
+
+BlobEntry::ItemCopyEntry::ItemCopyEntry(
+    scoped_refptr<ShareableBlobDataItem> source_item,
+    size_t source_item_offset,
+    scoped_refptr<ShareableBlobDataItem> dest_item)
+    : source_item(std::move(source_item)),
+      source_item_offset(source_item_offset),
+      dest_item(std::move(dest_item)) {}
+
+BlobEntry::ItemCopyEntry::ItemCopyEntry(ItemCopyEntry&& other) = default;
+BlobEntry::ItemCopyEntry& BlobEntry::ItemCopyEntry::operator=(
+    BlobEntry::ItemCopyEntry&& rhs) = default;
+BlobEntry::ItemCopyEntry::~ItemCopyEntry() {}
+
+BlobEntry::BuildingState::BuildingState(
+    bool transport_items_present,
+    PopulatationAllowedCallback can_populate_callback,
+    size_t num_building_dependent_blobs,
+    bool memory_quota_needed)
+    : transport_items_present(transport_items_present),
+      can_populate_callback(can_populate_callback),
+      dependent_building_blobs_present(num_building_dependent_blobs > 0),
+      num_building_dependent_blobs(num_building_dependent_blobs),
+      memory_quota_needed(memory_quota_needed) {}
+
+BlobEntry::BuildingState::~BuildingState() {}
+
+BlobEntry::BlobEntry(const std::string& content_type,
+                                   const std::string& content_disposition)
+    : content_type_(content_type), content_disposition_(content_disposition) {}
+BlobEntry::~BlobEntry() {}
+
+void BlobEntry::AppendSharedBlobItem(
+    const std::string& my_uuid,
+    scoped_refptr<ShareableBlobDataItem> item) {
+  DCHECK(item);
+  if (!items_.empty()) {
+    offsets_.push_back(size_);
+  }
+  size_ += item->item()->length();
+  item->referencing_blobs_mutable()->insert(my_uuid);
+  items_.push_back(std::move(item));
+}
+
+const std::vector<scoped_refptr<ShareableBlobDataItem>>&
+BlobEntry::items() const {
+  return items_;
+}
+
+void BlobEntry::RemoveBlobFromShareableItems(
+    const std::string& blob_uuid) {
+  for (auto& data_item : items_) {
+    data_item->referencing_blobs_mutable()->erase(blob_uuid);
+  }
+}
+
+size_t BlobEntry::GetUnsharedMemoryUsage() const {
+  size_t memory = 0;
+  base::hash_set<void*> seen_items;
+  for (const auto& data_item : items_) {
+    if (!IsBytes(data_item->item()->type()) ||
+        data_item->referencing_blobs().size() > 1 ||
+        seen_items.find(data_item.get()) != seen_items.end()) {
+      continue;
+    }
+    memory += data_item->item()->length();
+    seen_items.insert(data_item.get());
+  }
+  return memory;
+}
+
+}  // namespace storage