Refactor win printing workflow to support print preview.

chrome/renderer/print_web_view_helper.h

Index: chrome/renderer/print_web_view_helper.h
diff --git a/chrome/renderer/print_web_view_helper.h b/chrome/renderer/print_web_view_helper.h
index 075db13c626295f51446957d4df8c592bdc9d49f..2ba6fb4e21bf4f2ced38c53aaf3449b7bc5b1505 100644
--- a/chrome/renderer/print_web_view_helper.h
+++ b/chrome/renderer/print_web_view_helper.h
@@ -182,10 +182,9 @@ class PrintWebViewHelper : public WebKit::WebViewClient,
                   const float& scale_factor, int page_number,
                   WebKit::WebFrame* frame, printing::NativeMetafile* metafile);
 #elif defined(OS_WIN)
-  void RenderPage(const gfx::Size& page_size, float* scale_factor,
+  void RenderPage(const ViewMsg_Print_Params& params, float* scale_factor,
                   int page_number, WebKit::WebFrame* frame,
-                  scoped_ptr<printing::NativeMetafile>* metafile,
-                  bool supports_alpha_blend);
+                  scoped_ptr<printing::NativeMetafile>* metafile);
 #endif
 
 #if defined(OS_MACOSX) || defined(OS_WIN)