GestureLongPress should be able to invoke BUBBLE_MODE_FAST_USER_SWITCH.

chrome/browser/ui/views/frame/opaque_browser_frame_view.cc

 // Copyright (c) 2012 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/frame/opaque_browser_frame_view.h"
 
 #include <algorithm>
 #include <string>
 
 #include "base/compiler_specific.h"
@@ skipping 306 matching lines @@
     frame()->Minimize();
   } else if (sender == maximize_button_) {
     frame()->Maximize();
   } else if (sender == restore_button_) {
     frame()->Restore();
   } else if (sender == close_button_) {
     frame()->Close();
   } else if (sender == new_avatar_button()) {
     BrowserWindow::AvatarBubbleMode mode =
         BrowserWindow::AVATAR_BUBBLE_MODE_DEFAULT;
-    if (event.IsMouseEvent() &&
-        static_cast<const ui::MouseEvent&>(event).IsRightMouseButton()) {
+    if ((event.IsMouseEvent() &&
+         static_cast<const ui::MouseEvent&>(event).IsRightMouseButton()) ||
+        (event.type() == ui::ET_GESTURE_LONG_PRESS)) {
       mode = BrowserWindow::AVATAR_BUBBLE_MODE_FAST_USER_SWITCH;
     }
     browser_view()->ShowAvatarBubbleFromAvatarButton(
         mode,
         signin::ManageAccountsParams());
   }
 }
 
 void OpaqueBrowserFrameView::OnMenuButtonClicked(views::View* source,
                                                  const gfx::Point& point) {
@@ skipping 495 matching lines @@
       client_area_bottom + kClientEdgeThickness - client_area_top),
        toolbar_color);
   canvas->FillRect(gfx::Rect(client_area_bounds.x(), client_area_bottom,
                              client_area_bounds.width(), kClientEdgeThickness),
                    toolbar_color);
   canvas->FillRect(gfx::Rect(client_area_bounds.right(), client_area_top,
       kClientEdgeThickness,
       client_area_bottom + kClientEdgeThickness - client_area_top),
       toolbar_color);
 }