Preview tab data source. (Sample CL)

chrome/browser/ui/webui/print_preview_ui.cc

 // Copyright (c) 2011 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/browser/ui/webui/print_preview_ui.h"
 
 #include "base/values.h"
+#include "chrome/browser/printing/print_preview_data_service.h"
 #include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/ui/webui/print_preview_data_source.h"
 #include "chrome/browser/ui/webui/print_preview_handler.h"
-#include "chrome/browser/ui/webui/print_preview_ui_html_source.h"
-#include "content/browser/browser_thread.h"
 #include "content/browser/tab_contents/tab_contents.h"
 
-PrintPreviewUI::PrintPreviewUI(TabContents* contents)
-    : WebUI(contents),
-      html_source_(new PrintPreviewUIHTMLSource()) {
+PrintPreviewUI::PrintPreviewUI(TabContents* contents) : WebUI(contents) {
   // PrintPreviewUI owns |handler|.
   PrintPreviewHandler* handler = new PrintPreviewHandler();
   AddMessageHandler(handler->Attach(this));
 
-  // Set up the chrome://print/ source.
-  contents->profile()->GetChromeURLDataManager()->AddDataSource(html_source_);
+  // Set up the chrome://print/ data source.
+  contents->profile()->GetChromeURLDataManager()->AddDataSource(
+      new PrintPreviewDataSource(this));
+
+  printf("constructor : %p \n", this);
 }
 
 PrintPreviewUI::~PrintPreviewUI() {
+  print_preview_data_service()->RemoveEntry(this);
 }
 
-PrintPreviewUIHTMLSource* PrintPreviewUI::html_source() {
-  return html_source_.get();
+void PrintPreviewUI::GetPrintPreviewData(scoped_refptr<RefCountedBytes>* data) {
+  print_preview_data_service()->GetDataEntry(this, data);
+}
+
+void PrintPreviewUI::SetPrintPreviewData(const RefCountedBytes* data) {
+    print_preview_data_service()->SetDataEntry(this, data);
 }
 
 void PrintPreviewUI::OnInitiatorTabClosed(
     const std::string& initiator_url) {
   StringValue initiator_tab_url(initiator_url);
   CallJavascriptFunction("onInitiatorTabClosed", initiator_tab_url);
 }
 
 void PrintPreviewUI::OnPreviewDataIsAvailable(int expected_pages_count,
                                               const string16& job_title,
                                               bool modifiable) {
   VLOG(1) << "Print preview request finished with "
           << expected_pages_count << " pages";
   FundamentalValue pages_count(expected_pages_count);
   StringValue title(job_title);
   FundamentalValue is_preview_modifiable(modifiable);
   CallJavascriptFunction("updatePrintPreview", pages_count, title,
                          is_preview_modifiable);
 }
+
+PrintPreviewDataService* PrintPreviewUI::print_preview_data_service() {
+  return PrintPreviewDataService::GetInstance();
+}