Create a Factory for NativeMetafile.

chrome/renderer/print_web_view_helper_mac.mm

Index: chrome/renderer/print_web_view_helper_mac.mm
diff --git a/chrome/renderer/print_web_view_helper_mac.mm b/chrome/renderer/print_web_view_helper_mac.mm
index cc4a8d673e60159eca17d9a102b78e27272a2bf6..7a1f7e61ea90a60ed45175795d43f0a865c2050d 100644
--- a/chrome/renderer/print_web_view_helper_mac.mm
+++ b/chrome/renderer/print_web_view_helper_mac.mm
@@ -7,11 +7,13 @@
 #import <AppKit/AppKit.h>
 
 #include "base/logging.h"
+#include "base/scoped_ptr.h"
 #include "chrome/common/render_messages.h"
 #include "chrome/common/render_messages_params.h"
 #include "chrome/renderer/render_view.h"
 #include "grit/generated_resources.h"
 #include "printing/native_metafile.h"
+#include "printing/native_metafile_factory.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebFrame.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebCanvas.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebRect.h"
@@ -26,8 +28,9 @@ using WebKit::WebSize;
 void PrintWebViewHelper::PrintPage(const ViewMsg_PrintPage_Params& params,
                                    const gfx::Size& canvas_size,
                                    WebFrame* frame) {
-  printing::NativeMetafile metafile;
-  if (!metafile.Init())
+  scoped_ptr<printing::NativeMetafile> metafile(
+      printing::MetafileFactory::GetMetafile());
+  if (!metafile->Init())
     return;
 
   float scale_factor = frame->getPrintPageShrink(params.page_number);
@@ -38,16 +41,16 @@ void PrintWebViewHelper::PrintPage(const ViewMsg_PrintPage_Params& params,
   // Render page for printing.
   gfx::Point origin(0.0f, 0.0f);
   RenderPage(params.params.printable_size, origin, scale_factor, page_number,
-      frame, &metafile);
+      frame, metafile);
 
-  metafile.Close();
+  metafile->Close();
 
   double margin_left = params.params.margin_left;
   double margin_top = params.params.margin_top;
 
   // Get the size of the compiled metafile.
   ViewHostMsg_DidPrintPage_Params page_params;
-  page_params.data_size = metafile.GetDataSize();
+  page_params.data_size = metafile->GetDataSize();
   page_params.page_number = page_number;
   page_params.document_cookie = params.params.document_cookie;
   page_params.actual_shrink = scale_factor;
@@ -56,7 +59,7 @@ void PrintWebViewHelper::PrintPage(const ViewMsg_PrintPage_Params& params,
   page_params.content_area = gfx::Rect(margin_left, margin_top, width, height);
 
   // Ask the browser to create the shared memory for us.
-  if (!CopyMetafileDataToSharedMem(&metafile,
+  if (!CopyMetafileDataToSharedMem(metafile,
                                    &(page_params.metafile_data_handle))) {
     page_params.data_size = 0;
   }
@@ -80,8 +83,9 @@ void PrintWebViewHelper::CreatePreviewDocument(
   double originX = printParams.margin_left;
   double originY = printParams.margin_top;
 
-  printing::NativeMetafile metafile;
-  if (!metafile.Init())
+  scoped_ptr<printing::NativeMetafile> metafile(
+      printing::MetafileFactory::GetMetafile());
+  if (!metafile->Init())
     return;
 
   gfx::Point origin(originX, originY);
@@ -89,24 +93,24 @@ void PrintWebViewHelper::CreatePreviewDocument(
   if (params.pages.empty()) {
     for (int i = 0; i < page_count; ++i) {
       RenderPage(printParams.page_size, origin, scale_factor, i, frame,
-          &metafile);
+          metafile);
     }
   } else {
     for (size_t i = 0; i < params.pages.size(); ++i) {
       if (params.pages[i] >= page_count)
         break;
       RenderPage(printParams.page_size, origin, scale_factor,
-          static_cast<int>(params.pages[i]), frame, &metafile);
+          static_cast<int>(params.pages[i]), frame, metafile);
     }
   }
-  metafile.Close();
+  metafile->Close();
 
   ViewHostMsg_DidPreviewDocument_Params preview_params;
-  preview_params.data_size = metafile.GetDataSize();
+  preview_params.data_size = metafile->GetDataSize();
   preview_params.document_cookie = params.params.document_cookie;
 
   // Ask the browser to create the shared memory for us.
-  if (!CopyMetafileDataToSharedMem(&metafile,
+  if (!CopyMetafileDataToSharedMem(metafile,
           &(preview_params.metafile_data_handle))) {
     preview_params.data_size = 0;
   }