Create system tray item for accessing chrome://slow

ash/system/tray/system_tray_delegate.h

 // 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.
 
 #ifndef ASH_SYSTEM_TRAY_SYSTEM_TRAY_DELEGATE_H_
 #define ASH_SYSTEM_TRAY_SYSTEM_TRAY_DELEGATE_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 151 matching lines @@
   // Shows the settings related to network. If |service_path| is not empty,
   // show the settings for that network.
   virtual void ShowNetworkSettings(const std::string& service_path) = 0;
 
   // Shows the settings related to bluetooth.
   virtual void ShowBluetoothSettings() = 0;
 
   // Shows settings related to multiple displays.
   virtual void ShowDisplaySettings() = 0;
 
+  // Shows the page that lets you disable performance tracing.
+  virtual void ShowChromeSlow() = 0;
+
   // Returns true if the notification for the display configuration change
   // should appear.
   virtual bool ShouldShowDisplayNotification() = 0;
 
   // Shows settings related to Google Drive.
   virtual void ShowDriveSettings() = 0;
 
   // Shows settings related to input methods.
   virtual void ShowIMESettings() = 0;
 
@@ skipping 141 matching lines @@
   // Speaks the given text if spoken feedback is enabled.
   virtual void MaybeSpeak(const std::string& utterance) const = 0;
 
   // Creates a dummy delegate for testing.
   static SystemTrayDelegate* CreateDummyDelegate();
 };
 
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_TRAY_SYSTEM_TRAY_DELEGATE_H_