ash/chromeos: Add shift-alt-p shortcut to open palette.

ash/common/system/chromeos/palette/palette_tray.cc

 // Copyright 2016 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/common/system/chromeos/palette/palette_tray.h"
 
 #include "ash/common/shelf/shelf_constants.h"
 #include "ash/common/shelf/wm_shelf.h"
 #include "ash/common/shelf/wm_shelf_util.h"
 #include "ash/common/shell_window_ids.h"
@@ skipping 153 matching lines @@
 bool PaletteTray::PerformAction(const ui::Event& event) {
   if (bubble_) {
     bubble_.reset();
     return true;
   }
 
   return OpenBubble();
 }
 
 bool PaletteTray::OpenBubble() {
+  if (bubble_)
+    return false;
+
   views::TrayBubbleView::InitParams init_params(
       views::TrayBubbleView::ANCHOR_TYPE_TRAY, GetAnchorAlignment(),
       kPaletteWidth, kPaletteWidth);
   init_params.first_item_has_no_margin = true;
   init_params.can_activate = true;
   init_params.close_on_deactivate = true;
 
   DCHECK(tray_container());
 
   // Create view, customize it.
   views::TrayBubbleView* bubble_view =
       views::TrayBubbleView::Create(tray_container(), this, &init_params);
   bubble_view->SetArrowPaintType(views::BubbleBorder::PAINT_NONE);
   bubble_view->UseCompactMargins();
   bubble_view->set_margins(gfx::Insets(bubble_view->margins().top(), 0, 0, 0));
 
   // Add child views.
   bubble_view->AddChildView(new TitleView(this));
   bubble_view->AddChildView(CreateSeparator(views::Separator::HORIZONTAL));
   AddToolsToView(bubble_view);
 
   // Show the bubble.
   bubble_.reset(new ash::TrayBubbleWrapper(this, bubble_view));
 
   SetDrawBackgroundAsActive(true);
-
   return true;
 }
 
 void PaletteTray::AddToolsToView(views::View* host) {
   std::vector<PaletteToolView> views = palette_tool_manager_->CreateViews();
 
   // There may not be any registered tools.
   if (!views.size())
     return;
 
@@ skipping 142 matching lines @@
       WmShell::Get()->GetSessionStateDelegate();
 
   SetVisible(!session_state_delegate->IsScreenLocked() &&
              session_state_delegate->GetSessionState() ==
                  SessionStateDelegate::SESSION_STATE_ACTIVE &&
              WmShell::Get()->system_tray_delegate()->GetUserLoginStatus() !=
                  LoginStatus::KIOSK_APP);
 }
 
 }  // namespace ash