Splits debug_commands into aura and non-aura parts

ash/accelerators/debug_commands.h

 // Copyright 2013 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_ACCELERATORS_DEBUG_COMMANDS_H_
 #define ASH_ACCELERATORS_DEBUG_COMMANDS_H_
 
 #include "ash/accelerators/accelerator_table.h"
 #include "ash/ash_export.h"
 
 // This file contains implementations of commands that are used only when
 // debugging.
+//
+// NOTE: these commands may be enabled in about:flags, so that they may be
+// available at run time.
 namespace ash {
 namespace debug {
 
 // Print the views::View, ui::Layer and aura::Window hierarchies. This may be
 // useful in debugging user reported bugs.
 ASH_EXPORT void PrintUIHierarchies();
 
 // Returns true if debug accelerators are enabled.
 ASH_EXPORT bool DebugAcceleratorsEnabled();
 
 // Performs |action| if |action| belongs to a debug-only accelerator and debug
 // accelerators are enabled.
 ASH_EXPORT void PerformDebugActionIfEnabled(AcceleratorAction action);
 
 }  // namespace debug
 }  // namespace ash
 
 #endif  // ASH_ACCELERATORS_DEBUG_COMMANDS_H_