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

chrome/browser/printing/print_preview_message_handler.cc

Index: chrome/browser/printing/print_preview_message_handler.cc
diff --git a/chrome/browser/printing/print_preview_message_handler.cc b/chrome/browser/printing/print_preview_message_handler.cc
index d2b11813c98f09fd4b2e2da1fa898c80b2dc39ad..0c8d15b5e543f181b92a33964882518b732a7a07 100644
--- a/chrome/browser/printing/print_preview_message_handler.cc
+++ b/chrome/browser/printing/print_preview_message_handler.cc
@@ -80,9 +80,11 @@ void PrintPreviewMessageHandler::OnRequestPrintPreview() {
   PrintPreviewTabController::PrintPreview(tab_contents());
 }
 
-void PrintPreviewMessageHandler::OnDidGetPreviewPageCount(int document_cookie,
-                                                          int page_count,
-                                                          bool is_modifiable) {
+void PrintPreviewMessageHandler::OnDidGetPreviewPageCount(
+    int document_cookie,
+    int page_count,
+    bool is_modifiable,
+    bool clear_preview_data) {
   if (page_count <= 0)
     return;
   TabContents* print_preview_tab = GetPrintPreviewTab();
@@ -91,6 +93,10 @@ void PrintPreviewMessageHandler::OnDidGetPreviewPageCount(int document_cookie,
 
   PrintPreviewUI* print_preview_ui =
       static_cast<PrintPreviewUI*>(print_preview_tab->web_ui());
+
+  if (!is_modifiable || clear_preview_data)
+    print_preview_ui->ClearAllPreviewData();
+
   print_preview_ui->OnDidGetPreviewPageCount(
       document_cookie, page_count, is_modifiable);
 }
@@ -116,12 +122,7 @@ void PrintPreviewMessageHandler::OnDidPreviewPage(
     return;
   }
 
-  int requested_preview_page_index = INVALID_PAGE_INDEX;
   int page_number = params.page_number;
-
-  if (page_number == FIRST_PAGE_INDEX)
-    print_preview_ui->ClearAllPreviewData();
-
   if (page_number >= FIRST_PAGE_INDEX && params.data_size) {
     RefCountedBytes* data_bytes =
         GetDataFromHandle(params.metafile_data_handle, params.data_size);
@@ -129,12 +130,9 @@ void PrintPreviewMessageHandler::OnDidPreviewPage(
 
     print_preview_ui->SetPrintPreviewDataForIndex(page_number, data_bytes);
     print_preview_ui->OnDidPreviewPage(page_number);
-    // TODO(kmadhusu): Query |PrintPreviewUI| and update
-    // |requested_preview_page_index| accordingly.
   }
 
-  rvh->Send(new PrintMsg_ContinuePreview(rvh->routing_id(),
-                                         requested_preview_page_index));
+  rvh->Send(new PrintMsg_ContinuePreview(rvh->routing_id()));
 }
 
 void PrintPreviewMessageHandler::OnPagesReadyForPreview(