Instead of ArrayBuffer, pass blob with printerProvider.onPrintRequested

content/browser/browser_context.cc

Index: content/browser/browser_context.cc
diff --git a/content/browser/browser_context.cc b/content/browser/browser_context.cc
index 7618833119848bf485a9b2cc2326d15a5d5d98f8..91ae72701fabe54c7dfee8863532780656de8860 100644
--- a/content/browser/browser_context.cc
+++ b/content/browser/browser_context.cc
@@ -206,6 +206,7 @@ StoragePartition* BrowserContext::GetDefaultStoragePartition(
   return GetStoragePartition(browser_context, NULL);
 }
 
+// static
 void BrowserContext::CreateMemoryBackedBlob(BrowserContext* browser_context,
                                             const char* data, size_t length,
                                             const BlobCallback& callback) {
@@ -221,6 +222,26 @@ void BrowserContext::CreateMemoryBackedBlob(BrowserContext* browser_context,
 }
 
 // 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,