Instead of ArrayBuffer, pass blob with printerProvider.onPrintRequested

content/public/browser/browser_context.h

 // 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.
 
 #ifndef CONTENT_PUBLIC_BROWSER_BROWSER_CONTEXT_H_
 #define CONTENT_PUBLIC_BROWSER_BROWSER_CONTEXT_H_
 
 #include "base/callback_forward.h"
 #include "base/containers/hash_tables.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/supports_user_data.h"
 #include "content/common/content_export.h"
 #include "content/public/browser/zoom_level_delegate.h"
 #include "content/public/common/push_messaging_status.h"
 
 class GURL;
 
 namespace base {
 class FilePath;
+class Time;
 }
 
 namespace storage {
 class ExternalMountPoints;
 }
 
 namespace net {
 class URLRequestContextGetter;
 }
 
@@ skipping 51 matching lines @@
   static content::StoragePartition* GetDefaultStoragePartition(
       BrowserContext* browser_context);
 
   typedef base::Callback<void(scoped_ptr<BlobHandle>)> BlobCallback;
 
   // |callback| returns a nullptr scoped_ptr on failure.
   static void CreateMemoryBackedBlob(BrowserContext* browser_context,
                                      const char* data, size_t length,
                                      const BlobCallback& callback);
 
+  // |callback| returns a nullptr scoped_ptr on failure.
+  static void CreateFileBackedBlob(BrowserContext* browser_context,
+                                   const base::FilePath& path,
+                                   int64_t offset,
+                                   int64_t size,
+                                   const base::Time& expected_modification_time,
+                                   const BlobCallback& callback);
+
   // Delivers a push message with |data| to the Service Worker identified by
   // |origin| and |service_worker_registration_id|.
   static void DeliverPushMessage(
       BrowserContext* browser_context,
       const GURL& origin,
       int64 service_worker_registration_id,
       const std::string& data,
       const base::Callback<void(PushDeliveryStatus)>& callback);
 
   static void NotifyWillBeDestroyed(BrowserContext* browser_context);
@@ skipping 69 matching lines @@
   virtual PushMessagingService* GetPushMessagingService() = 0;
 
   // Returns the SSL host state decisions for this context. The context may
   // return nullptr, implementing the default exception storage strategy.
   virtual SSLHostStateDelegate* GetSSLHostStateDelegate() = 0;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_BROWSER_CONTEXT_H_