PrintPreview: Printing preview of a PDF on Mac with Skia only previews the last page of the PDF

webkit/plugins/ppapi/ppapi_plugin_instance.h

Index: webkit/plugins/ppapi/ppapi_plugin_instance.h
diff --git a/webkit/plugins/ppapi/ppapi_plugin_instance.h b/webkit/plugins/ppapi/ppapi_plugin_instance.h
index 346e157f9b863ed9825f680e410e3404fa853558..9eef2228656d8b4e0153e5b85c9d28da99b156ef 100644
--- a/webkit/plugins/ppapi/ppapi_plugin_instance.h
+++ b/webkit/plugins/ppapi/ppapi_plugin_instance.h
@@ -434,14 +434,14 @@ class PluginInstance : public base::RefCounted<PluginInstance>,
   // variable to hold on to the pixels.
   scoped_refptr<PPB_ImageData_Impl> last_printed_page_;
 #endif  // defined(OS_MACOSX)
-#if defined(OS_LINUX) || defined(OS_WIN)
-  // When printing to PDF (print preview, Linux) the entire document goes into
-  // one metafile.  However, when users print only a subset of all the pages,
-  // it is impossible to know if a call to PrintPage() is the last call.
-  // Thus in PrintPage(), just store the page number in |ranges_|.
-  // The hack is in PrintEnd(), where a valid |canvas_| is preserved in
-  // PrintWebViewHelper::PrintPages. This makes it possible to generate the
-  // entire PDF given the variables below:
+#if defined(USE_SKIA)
+  // Always when printing to PDF on Linux and when printing for preview on Mac
+  // and Win, the entire document goes into one metafile.  However, when users
+  // print only a subset of all the pages, it is impossible to know if a call
+  // to PrintPage() is the last call. Thus in PrintPage(), just store the page
+  // number in |ranges_|. The hack is in PrintEnd(), where a valid |canvas_|
+  // is preserved in PrintWebViewHelper::PrintPages. This makes it possible
+  // to generate the entire PDF given the variables below:
   //
   // The most recently used WebCanvas, guaranteed to be valid.
   SkRefPtr<WebKit::WebCanvas> canvas_;