[Print Preview]: Added code to support pdf fit to page functionality.

chrome/renderer/print_web_view_helper.cc

Index: chrome/renderer/print_web_view_helper.cc
diff --git a/chrome/renderer/print_web_view_helper.cc b/chrome/renderer/print_web_view_helper.cc
index b31cd851cfe5213c2219515b3dde4681cd01e5f7..275e3a6b58d264caa25d616f59d168acbb848b5d 100644
--- a/chrome/renderer/print_web_view_helper.cc
+++ b/chrome/renderer/print_web_view_helper.cc
@@ -867,6 +867,16 @@ void PrintWebViewHelper::OnPrintPreview(const DictionaryValue& settings) {
                                                    preview_params));
     return;
   }
+
+  // If we are previewing a pdf and the print scaling is disabled, send a
+  // message to browser.
+  if (!print_preview_context_.IsModifiable() &&
+      print_pages_params_->params.is_first_request &&
+      print_preview_context_.frame()->isPrintScalingDisabledForPlugin(
+          print_preview_context_.node())) {
+    Send(new PrintHostMsg_PrintPreviewScalingDisabled(routing_id()));
+  }
+
   // Always clear |old_print_pages_params_| before rendering the pages.
   old_print_pages_params_.reset();
   is_print_ready_metafile_sent_ = false;
@@ -1310,23 +1320,7 @@ bool PrintWebViewHelper::UpdatePrintSettings(
     modified_job_settings.SetBoolean(printing::kSettingHeaderFooterEnabled,
                                      false);
 
-    // - On Windows, we don't add a margin until we turn it into an EMF when
-    //   printing for print preview (We could add it in the plugin).
-    // - On Mac with Skia, we don't add a margin until we send it to the printer
-    //   using the CG PDF class (We could add it in the plugin).
-    // - On Mac with CG, we can add a margin when generating the preview.
-    // - On Linux, we never add a margin (We Could add it in the plugin).
-#if defined(OS_MACOSX) && !defined(USE_SKIA)
-    bool get_margins_from_pdf = !source_is_html && !print_for_preview_;
-#elif defined(OS_WIN) || defined(OS_MACOSX)
-    bool get_margins_from_pdf = !source_is_html && print_for_preview_;
-#else
-    bool get_margins_from_pdf = false;
-#endif
-
     printing::MarginType margin_type = printing::NO_MARGINS;
-    if (get_margins_from_pdf)
-      margin_type = GetMarginsForPdf(frame, node);
     modified_job_settings.SetInteger(printing::kSettingMarginsType,
                                      margin_type);
     job_settings = &modified_job_settings;
@@ -1381,9 +1375,25 @@ bool PrintWebViewHelper::UpdatePrintSettings(
     settings.params.print_to_pdf = IsPrintToPdfRequested(*job_settings);
     UpdateFrameMarginsCssInfo(*job_settings);
 
-    // Fit to paper size.
-    settings.params.fit_to_paper_size = source_is_html &&
-                                        !IsPrintToPdfRequested(*job_settings);
+    // Source is PDF (Fit to page)
+    bool fit_to_paper_size = false;
+    bool reset_fit_to_page_option = true;
+    if (!print_for_preview_ && !settings.params.print_to_pdf) {
+      if (settings.params.is_first_request && !source_is_html) {
+        // If print scaling is disabled, do not fit to paper size.
+        fit_to_paper_size = !print_preview_context_.frame()->
+            isPrintScalingDisabledForPlugin(print_preview_context_.node());
+      } else {
+        reset_fit_to_page_option = false;
+      }
+    }
+
+    if (reset_fit_to_page_option) {
+      settings.params.fit_to_paper_size = fit_to_paper_size;
+    } else if (!job_settings->GetBoolean(printing::kSettingFitToPageEnabled,
+          &(settings.params.fit_to_paper_size))) {
+        NOTREACHED();
+    }
 
     // Header/Footer: Set |header_footer_info_|.
     if (settings.params.display_header_footer) {