Add support code to test the cast system tray item.

ash/system/tray/system_tray.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/system/tray/system_tray.h"
 
 #include "ash/ash_switches.h"
 #include "ash/metrics/user_metrics_recorder.h"
 #include "ash/shelf/shelf_layout_manager.h"
 #include "ash/shell.h"
@@ skipping 164 matching lines @@
   AddTrayItem(new TrayEnterprise(this));
   AddTrayItem(new TraySupervisedUser(this));
   AddTrayItem(new TrayIME(this));
   AddTrayItem(tray_accessibility_);
   AddTrayItem(new TrayTracing(this));
   AddTrayItem(new TrayPower(this, message_center::MessageCenter::Get()));
   AddTrayItem(new TrayNetwork(this));
   AddTrayItem(new TrayVPN(this));
   AddTrayItem(new TraySms(this));
   AddTrayItem(new TrayBluetooth(this));
-  AddTrayItem(new TrayCast(this));
+  tray_cast_ = new TrayCast(this);
+  AddTrayItem(tray_cast_);
   AddTrayItem(new TrayDisplay(this));
   screen_capture_tray_item_ = new ScreenCaptureTrayItem(this);
   AddTrayItem(screen_capture_tray_item_);
   screen_share_tray_item_ = new ScreenShareTrayItem(this);
   AddTrayItem(screen_share_tray_item_);
   AddTrayItem(new MultiProfileMediaTrayItem(this));
   AddTrayItem(new TrayAudioChromeOs(this));
   AddTrayItem(new TrayBrightness(this));
   AddTrayItem(new TrayCapsLock(this));
   AddTrayItem(new TrayRotationLock(this));
   AddTrayItem(new TraySettings(this));
   AddTrayItem(new TrayUpdate(this));
   AddTrayItem(tray_date_);
 #elif defined(OS_WIN)
   AddTrayItem(tray_accessibility_);
   if (media::CoreAudioUtil::IsSupported())
     AddTrayItem(new TrayAudioWin(this));
   AddTrayItem(new TrayUpdate(this));
   AddTrayItem(tray_date_);
 #elif defined(OS_LINUX)
   AddTrayItem(tray_accessibility_);
   AddTrayItem(new TrayBluetooth(this));
-  AddTrayItem(new TrayCast(this));
+  tray_cast_ = new TrayCast(this);
+  AddTrayItem(tray_cast_);

[achuithb, 2015/07/14 18:06:39]

Tell me again why we have this on linux?

[jdufault, 2015/07/15 17:35:01]

I don't know - this was in the initial code you handed over to me.

[achuithb, 2015/07/15 18:56:47]

Let get rid of it and see if anything breaks. I believe this should still be
available on chromeos-chrome for linux

[jdufault, 2015/07/15 20:08:42]

Done.

   AddTrayItem(new TrayUpdate(this));
   AddTrayItem(tray_date_);
 #endif
 
   SetVisible(ash::Shell::GetInstance()->system_tray_delegate()->
       GetTrayVisibilityOnStartup());
 }
 
 void SystemTray::AddTrayItem(SystemTrayItem* item) {
   items_.push_back(item);
@@ skipping 468 matching lines @@
 void SystemTray::HideBubble(const TrayBubbleView* bubble_view) {
   HideBubbleWithView(bubble_view);
 }
 
 views::View* SystemTray::GetTrayItemViewForTest(SystemTrayItem* item) {
   std::map<SystemTrayItem*, views::View*>::iterator it =
       tray_item_map_.find(item);
   return it == tray_item_map_.end() ? NULL : it->second;
 }
 
+TrayCast* SystemTray::GetTrayCastForTesting() const { return tray_cast_; }
+
 TrayDate* SystemTray::GetTrayDateForTesting() const { return tray_date_; }
 
 bool SystemTray::PerformAction(const ui::Event& event) {
   // If we're already showing the default view, hide it; otherwise, show it
   // (and hide any popup that's currently shown).
   if (HasSystemBubbleType(SystemTrayBubble::BUBBLE_TYPE_DEFAULT)) {
     system_bubble_->bubble()->Close();
   } else {
     int arrow_offset = TrayBubbleView::InitParams::kArrowDefaultOffset;
     if (event.IsMouseEvent() || event.type() == ui::ET_GESTURE_TAP) {
@@ skipping 15 matching lines @@
   system_bubble_.reset();
   // When closing a system bubble with the alternate shelf layout, we need to
   // turn off the active tinting of the shelf.
   if (full_system_tray_menu_) {
     SetDrawBackgroundAsActive(false);
     full_system_tray_menu_ = false;
   }
 }
 
 }  // namespace ash