Support transition between chrome and user mode console

ui/display/chromeos/display_configurator.h

 // Copyright 2014 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 UI_DISPLAY_CHROMEOS_DISPLAY_CONFIGURATOR_H_
 #define UI_DISPLAY_CHROMEOS_DISPLAY_CONFIGURATOR_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 127 matching lines @@
 
   MultipleDisplayState display_state() const { return display_state_; }
   chromeos::DisplayPowerState requested_power_state() const {
     return requested_power_state_;
   }
   const gfx::Size framebuffer_size() const { return framebuffer_size_; }
   const std::vector<DisplayState>& cached_displays() const {
     return cached_displays_;
   }
 
+  // Called when an external process no longer needs to control the display
+  // and Chrome can take control.
+  void TakeControl();
+
+  // Called when an external process needs to control the display and thus
+  // Chrome should relinquish it.
+  void RelinquishControl();
+
   void set_state_controller(StateController* controller) {
     state_controller_ = controller;
   }
   void set_mirroring_controller(SoftwareMirroringController* controller) {
     mirroring_controller_ = controller;
   }
 
   // Replaces |native_display_delegate_| with the delegate passed in and sets
   // |configure_display_| to true. Should be called before Init().
   void SetDelegateForTesting(
@@ skipping 191 matching lines @@
 
   // Display protection requests of each client.
   ProtectionRequests client_protection_requests_;
 
   DISALLOW_COPY_AND_ASSIGN(DisplayConfigurator);
 };
 
 }  // namespace ui
 
 #endif  // UI_DISPLAY_CHROMEOS_DISPLAY_CONFIGURATOR_H_