Implement print preview tab controller.

chrome/browser/renderer_host/render_view_host.cc

Index: chrome/browser/renderer_host/render_view_host.cc
diff --git a/chrome/browser/renderer_host/render_view_host.cc b/chrome/browser/renderer_host/render_view_host.cc
index 134274e3cb61becaf1d6accf71228e6ba647f745..21a97a58c6c6ac4e34e9852ca7d01b07f7ac5b90 100644
--- a/chrome/browser/renderer_host/render_view_host.cc
+++ b/chrome/browser/renderer_host/render_view_host.cc
@@ -25,6 +25,7 @@
 #include "chrome/browser/in_process_webkit/session_storage_namespace.h"
 #include "chrome/browser/net/predictor_api.h"
 #include "chrome/browser/notifications/desktop_notification_service.h"
+#include "chrome/browser/printing/print_preview_tab_controller.h"
 #include "chrome/browser/profile.h"
 #include "chrome/browser/renderer_host/render_process_host.h"
 #include "chrome/browser/renderer_host/render_view_host_delegate.h"
@@ -2235,9 +2236,26 @@ void RenderViewHost::OnMsgShowPopup(
 }
 #endif
 
+TabContents* RenderViewHost::GetPrintPreviewTab() {
+  // current_tab is initiator_tab
+  TabContents* current_tab = delegate_? delegate_->GetAsTabContents() : NULL;
+  if (current_tab != NULL) {
+    // Get/Create preview tab for initiator tab.
+    printing::PrintPreviewTabController* tab_controller =

[Lei Zhang, 2010/11/12 02:10:55]

What happens when GetInstance() returns NULL?

[kmadhusu, 2010/11/12 22:21:48]

Made code change to check the return value.

+        printing::PrintPreviewTabController::GetInstance();
+    return tab_controller->get_print_preview_tab(
+        current_tab, delegate_->GetBrowserWindowID());
+  }
+  return NULL;
+}
+
 #if defined(OS_MACOSX) || defined(OS_WIN)
 void RenderViewHost::OnPageReadyForPreview(
     const ViewHostMsg_DidPrintPage_Params& params) {
+  // Get the print preview tab.
+  TabContents* preview_tab = GetPrintPreviewTab();
+  DCHECK(preview_tab != NULL);
+
   // TODO(kmadhusu): Function definition needs to be changed.
   // 'params' contains the metafile handle for preview.
 
@@ -2246,6 +2264,10 @@ void RenderViewHost::OnPageReadyForPreview(
 }
 #else
 void RenderViewHost::OnPagesReadyForPreview(int fd_in_browser) {
+  // Get the print preview tab.
+  TabContents* preview_tab = GetPrintPreviewTab();
+  DCHECK(preview_tab != NULL);
+
   // TODO(kmadhusu): Function definition needs to be changed.
   // fd_in_browser should be the file descriptor of the metafile.