remember the last metafile, instead of the last canvas

content/renderer/pepper/pepper_plugin_instance_impl.h

Index: content/renderer/pepper/pepper_plugin_instance_impl.h
diff --git a/content/renderer/pepper/pepper_plugin_instance_impl.h b/content/renderer/pepper/pepper_plugin_instance_impl.h
index dc08cfff6c7d0e8a085e2f1a3ec9db7d9faa366a..213c81262a0e64b0c91b9fb70f0a1ddc6e98c3c0 100644
--- a/content/renderer/pepper/pepper_plugin_instance_impl.h
+++ b/content/renderer/pepper/pepper_plugin_instance_impl.h
@@ -98,6 +98,10 @@ struct PPP_Instance_Combined;
 class ScopedPPVar;
 }
 
+namespace printing {
+class PdfMetafileSkia;
+}
+
 namespace content {
 
 class ContentDecryptorDelegate;
@@ -645,7 +649,8 @@ class CONTENT_EXPORT PepperPluginInstanceImpl
   // best format to use. Returns false if the plugin does not support any
   // print format that we can handle (we can handle only PDF).
   bool GetPreferredPrintOutputFormat(PP_PrintOutputFormat_Dev* format);
-  bool PrintPDFOutput(PP_Resource print_output, blink::WebCanvas* canvas);
+  bool PrintPDFOutput(PP_Resource print_output,
+                      printing::PdfMetafileSkia* metafile);
 
   // Updates the layer for compositing. This creates a layer and attaches to the
   // container if:
@@ -661,7 +666,7 @@ class CONTENT_EXPORT PepperPluginInstanceImpl
   // Internal helper function for PrintPage().
   void PrintPageHelper(PP_PrintPageNumberRange_Dev* page_ranges,
                        int num_ranges,
-                       blink::WebCanvas* canvas);
+                       printing::PdfMetafileSkia* metafile);
 
   void DoSetCursor(blink::WebCursorInfo* cursor);
 
@@ -835,12 +840,12 @@ class CONTENT_EXPORT PepperPluginInstanceImpl
   // 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_|
+  // number in |ranges_|. The hack is in PrintEnd(), where a valid |metafile_|
   // 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.
-  sk_sp<blink::WebCanvas> canvas_;
+  // The most recently used metafile_, guaranteed to be valid.
+  printing::PdfMetafileSkia* metafile_;
   // An array of page ranges.
   std::vector<PP_PrintPageNumberRange_Dev> ranges_;