Add a blocking version of the sync promo dialog

chrome/browser/ui/gtk/html_dialog_gtk.cc

Index: chrome/browser/ui/gtk/html_dialog_gtk.cc
diff --git a/chrome/browser/ui/gtk/html_dialog_gtk.cc b/chrome/browser/ui/gtk/html_dialog_gtk.cc
index 7c47641f630f7571e1c19391b852a4efbba76780..0153503a2215b5632a115f4e73aa225f4b132ae4 100644
--- a/chrome/browser/ui/gtk/html_dialog_gtk.cc
+++ b/chrome/browser/ui/gtk/html_dialog_gtk.cc
@@ -38,6 +38,10 @@ gfx::NativeWindow ShowHtmlDialog(gfx::NativeWindow parent,
   return html_dialog->InitDialog();
 }
 
+void CloseHtmlDialog(gfx::NativeWindow window) {
+  gtk_widget_destroy(window);
+}
+
 } // namespace browser
 
 namespace {
@@ -151,6 +155,30 @@ void HtmlDialogGtk::CloseContents(WebContents* source) {
     OnDialogClosed(std::string());
 }
 
+content::WebContents* HtmlDialogGtk::OpenURLFromTab(
+    content::WebContents* source,
+    const content::OpenURLParams& params) {
+  content::WebContents* new_contents = NULL;
+  if (delegate_ &&
+      delegate_->HandleOpenURLFromTab(source, params, &new_contents)) {
+    return new_contents;
+  }
+  return HtmlDialogTabContentsDelegate::OpenURLFromTab(source, params);
+}
+
+void HtmlDialogGtk::AddNewContents(content::WebContents* source,
+                                   content::WebContents* new_contents,
+                                   WindowOpenDisposition disposition,
+                                   const gfx::Rect& initial_pos,
+                                   bool user_gesture) {
+  if (delegate_ && delegate_->HandlerAddNewContents(
+      source, new_contents, disposition, initial_pos, user_gesture)) {
+    return;
+  }
+  HtmlDialogTabContentsDelegate::AddNewContents(
+      source, new_contents, disposition, initial_pos, user_gesture);
+}
+
 bool HtmlDialogGtk::ShouldShowDialogTitle() const {
   return true;
 }