gtk: Split DownloadShelfContextMenuGtk out to its own header file.

chrome/browser/ui/gtk/download/download_shelf_context_menu_gtk.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/gtk/download/download_shelf_context_menu_gtk.h"
+
+#include "base/logging.h"
+#include "chrome/browser/download/download_item_model.h"
+#include "chrome/browser/ui/gtk/download/download_item_gtk.h"
+#include "ui/gfx/point.h"
+
+DownloadShelfContextMenuGtk::DownloadShelfContextMenuGtk(
+    BaseDownloadItemModel* model,
+    DownloadItemGtk* download_item)
+    : DownloadShelfContextMenu(model),
+      download_item_gtk_(download_item) {
+}
+
+DownloadShelfContextMenuGtk::~DownloadShelfContextMenuGtk() {}
+
+void DownloadShelfContextMenuGtk::Popup(GtkWidget* widget,
+                                        GdkEventButton* event) {
+  if (download_item()->IsComplete())
+    menu_.reset(new MenuGtk(this, GetFinishedMenuModel()));
+  else
+    menu_.reset(new MenuGtk(this, GetInProgressMenuModel()));
+
+  if (widget)
+    menu_->PopupForWidget(widget, event->button, event->time);
+  else
+    menu_->PopupAsContext(gfx::Point(event->x_root, event->y_root),
+                          event->time);
+}
+
+void DownloadShelfContextMenuGtk::StoppedShowing() {
+  download_item_gtk_->menu_showing_ = false;
+  gtk_widget_queue_draw(download_item_gtk_->menu_button_);
+}
+
+GtkWidget* DownloadShelfContextMenuGtk::GetImageForCommandId(
+    int command_id) const {
+  const char* stock = NULL;
+  switch (command_id) {
+    case SHOW_IN_FOLDER:
+    case OPEN_WHEN_COMPLETE:
+      stock = GTK_STOCK_OPEN;
+      break;
+
+    case CANCEL:
+      stock = GTK_STOCK_CANCEL;
+      break;
+
+    case ALWAYS_OPEN_TYPE:
+    case TOGGLE_PAUSE:
+      stock = NULL;
+      break;
+
+    default:
+      NOTREACHED();
+      break;
+  }
+  return stock ? gtk_image_new_from_stock(stock, GTK_ICON_SIZE_MENU) : NULL;
+}