chromeos: Convert system tray session length limit to mojo

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 <algorithm>
 #include <map>
 #include <vector>
 
@@ skipping 219 matching lines @@
   web_notification_tray_ = nullptr;
 }
 
 void SystemTray::CreateItems(SystemTrayDelegate* delegate) {
   AddTrayItem(base::MakeUnique<TrayUser>(this));
 
   // Crucially, this trailing padding has to be inside the user item(s).
   // Otherwise it could be a main axis margin on the tray's box layout.
   AddTrayItem(base::MakeUnique<PaddingTrayItem>());
 
-  AddTrayItem(base::MakeUnique<TraySessionLengthLimit>(this));
+  tray_session_length_limit_ = new TraySessionLengthLimit(this);
+  AddTrayItem(base::WrapUnique(tray_session_length_limit_));
   tray_enterprise_ = new TrayEnterprise(this);
   AddTrayItem(base::WrapUnique(tray_enterprise_));
   tray_supervised_user_ = new TraySupervisedUser(this);
   AddTrayItem(base::WrapUnique(tray_supervised_user_));
   AddTrayItem(base::MakeUnique<TrayIME>(this));
   tray_accessibility_ = new TrayAccessibility(this);
   AddTrayItem(base::WrapUnique(tray_accessibility_));
   AddTrayItem(base::MakeUnique<TrayTracing>(this));
   AddTrayItem(
       base::MakeUnique<TrayPower>(this, message_center::MessageCenter::Get()));
@@ skipping 342 matching lines @@
 }
 
 TrayEnterprise* SystemTray::GetTrayEnterpriseForTesting() const {
   return tray_enterprise_;
 }
 
 TrayNetwork* SystemTray::GetTrayNetworkForTesting() const {
   return tray_network_;
 }
 
+TraySessionLengthLimit* SystemTray::GetTraySessionLengthLimitForTesting()

[msw, 2017/06/06 19:01:04]

aside: these could all be simple accessors inlined in the header.

[James Cook, 2017/06/07 00:48:13]

Acknowledged. I plan to introduce a testapi class, so I just stayed consistent
with the existing ones for now.

+    const {
+  return tray_session_length_limit_;
+}
+
 TraySupervisedUser* SystemTray::GetTraySupervisedUserForTesting() const {
   return tray_supervised_user_;
 }
 
 TraySystemInfo* SystemTray::GetTraySystemInfoForTesting() const {
   return tray_system_info_;
 }
 
 TrayTiles* SystemTray::GetTrayTilesForTesting() const {
   return tray_tiles_;
@@ skipping 88 matching lines @@
           .work_area()
           .height();
   if (work_area_height > 0) {
     UMA_HISTOGRAM_CUSTOM_COUNTS(
         "Ash.SystemMenu.PercentageOfWorkAreaHeightCoveredByMenu",
         100 * bubble_view->height() / work_area_height, 1, 300, 100);
   }
 }
 
 }  // namespace ash