[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..75dc9c21093e7f7f5fd3bb91afb98d0287c186c7 100644
--- a/chrome/renderer/print_web_view_helper.cc
+++ b/chrome/renderer/print_web_view_helper.cc
@@ -341,6 +341,15 @@ printing::MarginType GetMarginsForPdf(WebFrame* frame, const WebNode& node) {
     return printing::PRINTABLE_AREA_MARGINS;
 }
 
+bool FitToPageEnabled(const DictionaryValue& job_settings) {
+  bool fit_to_paper_size = false;
+  if (!job_settings.GetBoolean(printing::kSettingFitToPageEnabled,
+                               &fit_to_paper_size)) {
+    NOTREACHED();
+  }
+  return fit_to_paper_size;
+}
+
 // Get the (x, y) coordinate from where printing of the current text should
 // start depending on the horizontal alignment (LEFT, RIGHT, CENTER) and
 // vertical alignment (TOP, BOTTOM).
@@ -833,6 +842,43 @@ bool PrintWebViewHelper::IsPrintToPdfRequested(
   return print_to_pdf;
 }
 
+void PrintWebViewHelper::UpdateFitToPageInfo(
+    WebKit::WebFrame* frame, const WebKit::WebNode& node,
+    const DictionaryValue& job_settings, PrintMsg_PrintPages_Params* settings) {
+  bool source_is_html = true;
+  if (print_for_preview_) {
+    if (!job_settings.GetBoolean(printing::kSettingPreviewModifiable,
+                                 &source_is_html)) {
+      NOTREACHED();
+    }
+  } else {
+    source_is_html = !PrintingNodeOrFrame(frame, node);
+  }
+
+  settings->params.fit_to_paper_size = true;
+  if (print_for_preview_ || settings->params.print_to_pdf) {
+    // Do not fit to paper size when the user is printing the preview data or
+    // saving the print contents as pdf.
+    settings->params.fit_to_paper_size = false;
+  } else if (!source_is_html) {
+    // PDF in initiator renderer. Get the print scaling option for the initiator
+    // renderer pdf.
+    bool print_scaling_disabled = frame->isPrintScalingDisabledForPlugin(node);
+
+    // If this is the first preview request, UI doesn't know about the print
+    // scaling option of the plugin. Therefore, check the print scaling option
+    // and update the print params accordingly.
+    //
+    // If this is not the first preview request, update print params based on
+    // preview job settings.
+    if ((settings.params.is_first_request &&
+             print_scaling_disabled_for_plugin) ||
+        !FitToPageEnabled(job_settings)) {
+      settings->params.fit_to_paper_size = false;
+    }
+  }
+}
+
 void PrintWebViewHelper::OnPrintPreview(const DictionaryValue& settings) {
   DCHECK(is_preview_enabled_);
   print_preview_context_.OnPrintPreview();
@@ -867,6 +913,16 @@ 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 +1366,7 @@ 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;
@@ -1380,10 +1420,7 @@ 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);
+    UpdateFitToPageInfo(frame, node, job_settings, &settings);
 
     // Header/Footer: Set |header_footer_info_|.
     if (settings.params.display_header_footer) {