Adds option to enable CSS backgrounds for printing.

chrome/common/print_messages.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/common/print_messages.h"
 
 #include "base/basictypes.h"
 #include "base/string16.h"
 #include "ui/gfx/size.h"
 
@@ skipping 11 matching lines @@
     selection_only(false),
     supports_alpha_blend(false),
     preview_ui_id(-1),
     preview_request_id(0),
     is_first_request(false),
     print_scaling_option(WebKit::WebPrintScalingOptionSourceSize),
     print_to_pdf(false),
     display_header_footer(false),
     date(),
     title(),
-    url() {
+    url(),
+    should_print_backgrounds(false) {
 }
 
 PrintMsg_Print_Params::~PrintMsg_Print_Params() {}
 
 void PrintMsg_Print_Params::Reset() {
   page_size = gfx::Size();
   content_size = gfx::Size();
   printable_area = gfx::Rect();
   margin_top = 0;
   margin_left = 0;
   dpi = 0;
   min_shrink = 0;
   max_shrink = 0;
   desired_dpi = 0;
   document_cookie = 0;
   selection_only = false;
   supports_alpha_blend = false;
   preview_ui_id = -1;
   preview_request_id = 0;
   is_first_request = false;
   print_scaling_option = WebKit::WebPrintScalingOptionSourceSize;
   print_to_pdf = false;
   display_header_footer = false;
   date = string16();
   title = string16();
   url = string16();
+  should_print_backgrounds = false;
 }
 
 PrintMsg_PrintPages_Params::PrintMsg_PrintPages_Params()
   : pages() {
 }
 
 PrintMsg_PrintPages_Params::~PrintMsg_PrintPages_Params() {}
 
 void PrintMsg_PrintPages_Params::Reset() {
   params.Reset();
   pages = std::vector<int>();
 }