Instead of ArrayBuffer, pass blob with printerProvider.onPrintRequested

extensions/browser/api/printer_provider/printer_provider_print_job.h

Index: extensions/browser/api/printer_provider/printer_provider_print_job.h
diff --git a/extensions/browser/api/printer_provider/printer_provider_print_job.h b/extensions/browser/api/printer_provider/printer_provider_print_job.h
index 36967c4f3daa3293db495280925daae0a5fd7b39..81fc9b8674fd47fd1aa6aabfa60cb8e4f548803f 100644
--- a/extensions/browser/api/printer_provider/printer_provider_print_job.h
+++ b/extensions/browser/api/printer_provider/printer_provider_print_job.h
@@ -7,7 +7,8 @@
 
 #include <string>
 
-#include "base/macros.h"
+#include "base/files/file.h"
+#include "base/files/file_path.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/ref_counted_memory.h"
 
@@ -15,6 +16,9 @@ namespace extensions {
 
 // Struct describing print job that should be forwarded to an extension via
 // chrome.printerProvider.onPrintRequested event.
+// TODO(tbarzic): This should probably be a class and have some methods, e.g.
+// whether the job is initialized and whether the data is described using a file
+// or bytes.
 struct PrinterProviderPrintJob {
   PrinterProviderPrintJob();
   ~PrinterProviderPrintJob();
@@ -32,11 +36,17 @@ struct PrinterProviderPrintJob {
   // Content type of the document that should be printed.
   std::string content_type;
 
-  // The document data that should be printed.
+  // The document data that should be printed. Should be NULL if document data
+  // is kept in a file.
   scoped_refptr<base::RefCountedMemory> document_bytes;
 
- private:
-  DISALLOW_COPY_AND_ASSIGN(PrinterProviderPrintJob);
+  // Path of the file which contains data to be printed. Should be set only if
+  // |document_bytes| are NULL.
+  base::FilePath document_path;
+
+  // Information about the file which contains data to be printed. Should be
+  // set only if |document_path| is set.
+  base::File::Info file_info;
 };
 
 }  // namespace extensions