Instead of ArrayBuffer, pass blob with printerProvider.onPrintRequested

content/browser/browser_context.cc

 // Copyright (c) 2012 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 "content/public/browser/browser_context.h"
 
 #if !defined(OS_IOS)
 #include "content/browser/download/download_manager_impl.h"
 #include "content/browser/fileapi/chrome_blob_storage_context.h"
 #include "content/browser/indexed_db/indexed_db_context_impl.h"
@@ skipping 188 matching lines @@
     return;
 
   partition_map->ForEach(callback);
 }
 
 StoragePartition* BrowserContext::GetDefaultStoragePartition(
     BrowserContext* browser_context) {
   return GetStoragePartition(browser_context, NULL);
 }
 
+// static
 void BrowserContext::CreateMemoryBackedBlob(BrowserContext* browser_context,
                                             const char* data, size_t length,
                                             const BlobCallback& callback) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 
   ChromeBlobStorageContext* blob_context =
       ChromeBlobStorageContext::GetFor(browser_context);
   BrowserThread::PostTaskAndReplyWithResult(
       BrowserThread::IO, FROM_HERE,
       base::Bind(&ChromeBlobStorageContext::CreateMemoryBackedBlob,
                  make_scoped_refptr(blob_context), data, length),
       callback);
 }
 
 // static
+void BrowserContext::CreateFileBackedBlob(
+    BrowserContext* browser_context,
+    const base::FilePath& path,
+    int64_t offset,
+    int64_t size,
+    const base::Time& expected_modification_time,
+    const BlobCallback& callback) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+
+  ChromeBlobStorageContext* blob_context =
+      ChromeBlobStorageContext::GetFor(browser_context);
+  BrowserThread::PostTaskAndReplyWithResult(
+      BrowserThread::IO, FROM_HERE,
+      base::Bind(&ChromeBlobStorageContext::CreateFileBackedBlob,
+                 make_scoped_refptr(blob_context), path, offset, size,
+                 expected_modification_time),
+      callback);
+}
+
+// static
 void BrowserContext::DeliverPushMessage(
     BrowserContext* browser_context,
     const GURL& origin,
     int64 service_worker_registration_id,
     const std::string& data,
     const base::Callback<void(PushDeliveryStatus)>& callback) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   PushMessagingRouter::DeliverMessage(
       browser_context, origin, service_worker_registration_id, data, callback);
 }
@@ skipping 55 matching lines @@
 #endif  // !OS_IOS
 
 BrowserContext::~BrowserContext() {
 #if !defined(OS_IOS)
   if (GetUserData(kDownloadManagerKeyName))
     GetDownloadManager(this)->Shutdown();
 #endif
 }
 
 }  // namespace content