Ignore UI scaling when internal display isn't active (in docked mode, for example)

ash/display/display_manager.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_DISPLAY_DISPLAY_MANAGER_H_
 #define ASH_DISPLAY_DISPLAY_MANAGER_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 222 matching lines @@
   const gfx::Display& GetPrimaryDisplayCandidate() const;
 
   // Returns the logical number of displays. This returns 1
   // when displays are mirrored.
   size_t GetNumDisplays() const;
 
   const DisplayList& active_display_list() const {
     return active_display_list_;
   }
 
+  // Returns true if the display specified by |display_id| is currently
+  // connected and active. (mirroring display isn't active, for example).
+  bool IsActiveDisplayId(int64 display_id) const;
+
   // Returns the number of connected displays. This returns 2
   // when displays are mirrored.
   size_t num_connected_displays() const { return num_connected_displays_; }
 
   // Returns the mirroring status.
   bool IsInMirrorMode() const;
   int64 mirroring_display_id() const { return mirroring_display_id_; }
   const DisplayList& software_mirroring_display_list() const {
     return software_mirroring_display_list_;
   }
@@ skipping 188 matching lines @@
   bool unified_desktop_enabled_;
 
   base::WeakPtrFactory<DisplayManager> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DisplayManager);
 };
 
 }  // namespace ash
 
 #endif  // ASH_DISPLAY_DISPLAY_MANAGER_H_