Fixed issue with shrink output when using system print dialog.

chrome/renderer/print_web_view_helper.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/renderer/print_web_view_helper.h"
 
 #include <string>
 
+#include "base/auto_reset.h"
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
 #include "base/string_number_conversions.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/print_messages.h"
 #include "chrome/common/render_messages.h"
 #include "chrome/common/url_constants.h"
 #include "chrome/renderer/prerender/prerender_helper.h"
@@ skipping 639 matching lines @@
 PrintWebViewHelper::PrintWebViewHelper(content::RenderView* render_view)
     : content::RenderViewObserver(render_view),
       content::RenderViewObserverTracker<PrintWebViewHelper>(render_view),
       print_web_view_(NULL),
       is_preview_enabled_(IsPrintPreviewEnabled()),
       is_print_ready_metafile_sent_(false),
       ignore_css_margins_(false),
       fit_to_page_(true),
       user_cancelled_scripted_print_count_(0),
       is_scripted_printing_blocked_(false),
-      notify_browser_of_print_failure_(true) {
+      notify_browser_of_print_failure_(true),
+      print_for_preview_(false) {
 }
 
 PrintWebViewHelper::~PrintWebViewHelper() {}
 
 bool PrintWebViewHelper::IsScriptInitiatedPrintAllowed(
     WebKit::WebFrame* frame) {
   if (is_scripted_printing_blocked_)
     return false;
   return !IsScriptInitiatedPrintTooFrequent(frame);
 }
@@ skipping 57 matching lines @@
 
   WebDocument document = main_frame->document();
   // <object> with id="pdf-viewer" is created in
   // chrome/browser/resources/print_preview/print_preview.js
   WebElement pdf_element = document.getElementById("pdf-viewer");
   if (pdf_element.isNull()) {
     NOTREACHED();
     return;
   }
 
+  // Set |print_for_preview_| flag and autoreset it to back to original
+  // on return.
+  AutoReset<bool> set_printing_flag(&print_for_preview_, true);
+
   WebFrame* pdf_frame = pdf_element.document().frame();
-  if (!UpdatePrintSettings(pdf_frame, pdf_element, job_settings, true)) {
+  // TODO(gene): Consider using |print_for_preview_| inside UpdatePrintSettings
+  // instead of passing this as parameter.
+  if (!UpdatePrintSettings(pdf_frame, pdf_element,
+                           job_settings, print_for_preview_)) {
     LOG(ERROR) << "UpdatePrintSettings failed";
     DidFinishPrinting(FAIL_PRINT);
     return;
   }
 
   // Render Pages for printing.
   if (!RenderPagesForPrint(pdf_frame, pdf_element)) {
     LOG(ERROR) << "RenderPagesForPrint failed";
     DidFinishPrinting(FAIL_PRINT);
   }
@@ skipping 1054 matching lines @@
   DCHECK(IsRendering());
   return prep_frame_view_->GetPrintCanvasSize();
 }
 
 void PrintWebViewHelper::PrintPreviewContext::ClearContext() {
   prep_frame_view_.reset();
   metafile_.reset();
   pages_to_render_.clear();
   error_ = PREVIEW_ERROR_NONE;
 }