ash: Process double-click event only for left-button clicks.

ash/wm/workspace/workspace_event_handler.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 "ash/wm/workspace/workspace_event_handler.h"
 
 #include "ash/screen_ash.h"
 #include "ash/shell.h"
 #include "ash/shell_delegate.h"
 #include "ash/touch/touch_uma.h"
@@ skipping 77 matching lines @@
       break;
     case ui::ET_MOUSE_PRESSED: {
       // Maximize behavior is implemented as post-target handling so the target
       // can cancel it.
       if (ui::EventCanceledDefaultHandling(*event)) {
         ToplevelWindowEventHandler::OnMouseEvent(event);
         return;
       }
 
       if (event->flags() & ui::EF_IS_DOUBLE_CLICK &&
+          event->IsOnlyLeftMouseButton() &&
           target->delegate()->GetNonClientComponent(event->location()) ==
           HTCAPTION &&
           !ash::Shell::IsForcedMaximizeMode()) {
         bool destroyed = false;
         destroyed_ = &destroyed;
         ash::Shell::GetInstance()->delegate()->RecordUserMetricsAction(
             ash::UMA_TOGGLE_MAXIMIZE_CAPTION_CLICK);
         ToggleMaximizedState(target);
         if (destroyed)
           return;
@@ skipping 78 matching lines @@
                                      origin.y(),
                                      work_area.width(),
                                      target->bounds().height()));
       }
     }
   }
 }
 
 }  // namespace internal
 }  // namespace ash