[BlobAsync] Disk support for blob storage

storage/browser/blob/blob_data_handle.cc

Index: storage/browser/blob/blob_data_handle.cc
diff --git a/storage/browser/blob/blob_data_handle.cc b/storage/browser/blob/blob_data_handle.cc
index 55e63a1b620697add3368bf82cd0537387de0eb5..2b67bbd5ec060626566e15d9cc92c8a4c235f024 100644
--- a/storage/browser/blob/blob_data_handle.cc
+++ b/storage/browser/blob/blob_data_handle.cc
@@ -67,10 +67,12 @@ BlobDataHandle::BlobDataHandleShared::BlobDataHandleShared(
     const std::string& uuid,
     const std::string& content_type,
     const std::string& content_disposition,
+    uint64_t size,
     BlobStorageContext* context)
     : uuid_(uuid),
       content_type_(content_type),
       content_disposition_(content_disposition),
+      size_(size),
       context_(context->AsWeakPtr()) {
   context_->IncrementBlobRefCount(uuid);
 }
@@ -92,12 +94,14 @@ BlobDataHandle::BlobDataHandleShared::~BlobDataHandleShared() {
 BlobDataHandle::BlobDataHandle(const std::string& uuid,
                                const std::string& content_type,
                                const std::string& content_disposition,
+                               uint64_t size,
                                BlobStorageContext* context,
                                base::SequencedTaskRunner* io_task_runner)
     : io_task_runner_(io_task_runner),
       shared_(new BlobDataHandleShared(uuid,
                                        content_type,
                                        content_disposition,
+                                       size,
                                        context)) {
   DCHECK(io_task_runner_.get());
   DCHECK(io_task_runner_->RunsTasksOnCurrentThread());
@@ -160,4 +164,8 @@ const std::string& BlobDataHandle::content_disposition() const {
   return shared_->content_disposition_;
 }
 
+uint64_t BlobDataHandle::size() const {
+  return shared_->size_;
+}
+
 }  // namespace storage