Print preview page selection should not require a rerendering of draft pages.

chrome/renderer/mock_render_thread.cc

Index: chrome/renderer/mock_render_thread.cc
diff --git a/chrome/renderer/mock_render_thread.cc b/chrome/renderer/mock_render_thread.cc
index aac71561a37d6ce2e0e2e940dcf405481eae0cfe..1a66d41f9b17d5bfbad478ec65237de2c731b10a 100644
--- a/chrome/renderer/mock_render_thread.cc
+++ b/chrome/renderer/mock_render_thread.cc
@@ -16,6 +16,7 @@
 #include "ipc/ipc_message_utils.h"
 #include "ipc/ipc_sync_message.h"
 #include "printing/print_job_constants.h"
+#include "printing/page_range.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 MockRenderThread::MockRenderThread()
@@ -213,7 +214,8 @@ void MockRenderThread::OnDidPrintPage(
 
 void MockRenderThread::OnDidGetPreviewPageCount(int document_cookie,
                                                 int number_pages,
-                                                bool is_modifiable) {
+                                                bool is_modifiable,
+                                                bool clear_preview_data) {
   print_preview_pages_remaining_ = number_pages;
 }
 
@@ -242,8 +244,29 @@ void MockRenderThread::OnUpdatePrintSettings(
   }
 
   // Just return the default settings.
-  if (printer_.get())
-    printer_->UpdateSettings(document_cookie, params);
+  if (printer_.get()) {
+    ListValue* page_range_array = new ListValue();
+    printing::PageRanges new_ranges;
+    if (job_settings.GetList(printing::kSettingPageRange, &page_range_array)) {
+      for (size_t index = 0; index < page_range_array->GetSize(); ++index) {
+        DictionaryValue* dict;
+        if (!page_range_array->GetDictionary(index, &dict))
+          continue;
+        printing::PageRange range;
+        if (!dict->GetInteger(printing::kSettingPageRangeFrom, &range.from) ||
+            !dict->GetInteger(printing::kSettingPageRangeTo, &range.to)) {
+          continue;
+        }
+        // Page numbers are 1-based in the dictionary.
+        // Page numbers are 0-based for the printing context.
+        range.from--;
+        range.to--;
+        new_ranges.push_back(range);
+      }
+    }
+    std::vector<int> pages(printing::PageRange::GetPages(new_ranges));
+    printer_->UpdateSettings(document_cookie, params, pages);
+  }
 }
 
 void MockRenderThread::set_print_dialog_user_response(bool response) {