Don't show FileManagerDialog if another FileManagerDialog is shown in the same tab.

chrome/browser/ui/views/file_manager_dialog.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/views/file_manager_dialog.h"
 
 #include "base/logging.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/singleton.h"
 #include "chrome/browser/extensions/extension_file_browser_private_api.h"
@@ skipping 154 matching lines @@
 RenderViewHost* FileManagerDialog::GetRenderViewHost() {
   if (extension_dialog_)
     return extension_dialog_->host()->render_view_host();
   return NULL;
 }
 
 void FileManagerDialog::AddPending(int32 tab_id) {
   PendingDialog::GetInstance()->Add(tab_id, this);
 }
 
+// static
+bool FileManagerDialog::PendingExists(int32 tab_id) {
+  return PendingDialog::GetInstance()->Find(tab_id) != NULL;
+}
+
 bool FileManagerDialog::HasMultipleFileTypeChoicesImpl() {
   return hasMultipleFileTypeChoices_;
 }
 
 void FileManagerDialog::SelectFileImpl(
     Type type,
     const string16& title,
     const FilePath& default_path,
     const FileTypeInfo* file_types,
     int file_type_index,
     const FilePath::StringType& default_extension,
     gfx::NativeWindow owner_window,
     void* params) {
   if (owner_window_) {
     LOG(ERROR) << "File dialog already in use!";
     return;
   }
   // Extension background pages may not supply an owner_window.
   Browser* owner_browser = (owner_window ?
       BrowserList::FindBrowserWithWindow(owner_window) :
       BrowserList::GetLastActive());
   if (!owner_browser) {
     NOTREACHED() << "Can't find owning browser";
     return;
   }
 
+  TabContentsWrapper* tab = owner_browser->GetSelectedTabContentsWrapper();
+
+  // Check if we have another dialog opened in the tab. It's unlikely, but
+  // possible.
+  int32 tab_id = tab ? tab->restore_tab_helper()->session_id().id() : 0;
+  if (PendingExists(tab_id))
+    return;
+
   FilePath virtual_path;
   if (!FileManagerUtil::ConvertFileToRelativeFileSystemPath(
           owner_browser->profile(), default_path, &virtual_path)) {
     virtual_path = default_path.BaseName();
   }
 
   hasMultipleFileTypeChoices_ =
       file_types ? file_types->extensions.size() > 1 : true;
 
   GURL file_browser_url = FileManagerUtil::GetFileBrowserUrlWithParams(
       type, title, virtual_path, file_types, file_type_index,
       default_extension);
-  TabContentsWrapper* tab = owner_browser->GetSelectedTabContentsWrapper();
+
   ExtensionDialog* dialog = ExtensionDialog::Show(file_browser_url,
       owner_browser, tab->tab_contents(),
       kFileManagerWidth, kFileManagerHeight,
       this /* ExtensionDialog::Observer */);
   if (!dialog) {
     LOG(ERROR) << "Unable to create extension dialog";
     return;
   }
 
   // Connect our listener to FileDialogFunction's per-tab callbacks.
-  int32 tab_id = (tab ? tab->restore_tab_helper()->session_id().id() : 0);
   AddPending(tab_id);
 
   extension_dialog_ = dialog;
   params_ = params;
   tab_id_ = tab_id;
   owner_window_ = owner_window;
 }