Instead of ArrayBuffer, pass blob with printerProvider.onPrintRequested

extensions/browser/api/printer_provider_internal/printer_provider_internal_api.h

Index: extensions/browser/api/printer_provider_internal/printer_provider_internal_api.h
diff --git a/extensions/browser/api/printer_provider_internal/printer_provider_internal_api.h b/extensions/browser/api/printer_provider_internal/printer_provider_internal_api.h
index 703ffb56625987b13ab4789c1baa66201f70f2f6..611e3118ef8b9aada128d5adbc5a43f40e46feed 100644
--- a/extensions/browser/api/printer_provider_internal/printer_provider_internal_api.h
+++ b/extensions/browser/api/printer_provider_internal/printer_provider_internal_api.h
@@ -5,6 +5,8 @@
 #ifndef EXTENSIONS_BROWSER_API_PRINTER_PROVIDER_INTERNAL_PRINTER_PROVIDER_INTERNAL_API_H_
 #define EXTENSIONS_BROWSER_API_PRINTER_PROVIDER_INTERNAL_PRINTER_PROVIDER_INTERNAL_API_H_
 
+#include <string>
+
 #include "base/macros.h"
 #include "base/observer_list.h"
 #include "extensions/browser/api/printer_provider_internal/printer_provider_internal_api_observer.h"
@@ -18,6 +20,7 @@ class ListValue;
 }
 
 namespace content {
+class BlobHandle;
 class BrowserContext;
 }
 
@@ -128,6 +131,26 @@ class PrinterProviderInternalReportPrintersFunction
   DISALLOW_COPY_AND_ASSIGN(PrinterProviderInternalReportPrintersFunction);
 };
 
+class PrinterProviderInternalGetPrintDataFunction
+    : public UIThreadExtensionFunction {
+ public:
+  PrinterProviderInternalGetPrintDataFunction();
+
+ protected:
+  ~PrinterProviderInternalGetPrintDataFunction() override;
+  ExtensionFunction::ResponseAction Run() override;
+
+ private:
+  void OnBlob(const std::string& type,
+              int size,
+              const scoped_refptr<base::RefCountedMemory>& data,
+              scoped_ptr<content::BlobHandle> blob);
+  DECLARE_EXTENSION_FUNCTION("printerProviderInternal.getPrintData",
+                             PRINTERPROVIDERINTERNAL_GETPRINTDATA)
+
+  DISALLOW_COPY_AND_ASSIGN(PrinterProviderInternalGetPrintDataFunction);
+};
+
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_API_PRINTER_PROVIDER_INTERNAL_PRINTER_PROVIDER_INTERNAL_API_H_