Async frame preparation for Preview with support if selection.

chrome/renderer/chrome_mock_render_thread.cc

Index: chrome/renderer/chrome_mock_render_thread.cc
diff --git a/chrome/renderer/chrome_mock_render_thread.cc b/chrome/renderer/chrome_mock_render_thread.cc
index 79b1f733a9f5b70d3f8ce8d174f3a1bdef4ca37f..d80d4c8a3f5f794d9aca074f6a15d43d4935dfe7 100644
--- a/chrome/renderer/chrome_mock_render_thread.cc
+++ b/chrome/renderer/chrome_mock_render_thread.cc
@@ -184,6 +184,11 @@ void ChromeMockRenderThread::OnUpdatePrintSettings(
   }
   std::vector<int> pages(printing::PageRange::GetPages(new_ranges));
   printer_->UpdateSettings(document_cookie, params, pages, margins_type);
+
+  job_settings.GetBoolean(printing::kSettingShouldPrintSelectionOnly,
+                          &params->params.selection_only);
+  job_settings.GetBoolean(printing::kSettingShouldPrintBackgrounds,
+                          &params->params.should_print_backgrounds);
 }
 
 MockPrinter* ChromeMockRenderThread::printer() {