Move DisplayList to display; add ScreenBase.

ui/display/manager/display_layout.h

 // Copyright 2016 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_MANAGER_DISPLAY_LAYOUT_H_
 #define UI_DISPLAY_MANAGER_DISPLAY_LAYOUT_H_
 
 #include <stdint.h>
 
 #include <memory>
 #include <string>
 #include <vector>
 
 #include "base/macros.h"
 #include "base/strings/string_piece.h"
 #include "ui/display/display_export.h"
 
 namespace base {
 class Value;
 template <typename T> class JSONValueConverter;
 }
 
 namespace display {
 class Display;
 
 // An identifier used to manage display layout in DisplayManager /
 // DisplayLayoutStore.
 using DisplayIdList = std::vector<int64_t>;
 
-using DisplayList = std::vector<Display>;
+using Displays = std::vector<Display>;
 
 // DisplayPlacement specifies where the display (D) is placed relative to
 // parent (P) display. In the following example, D given by |display_id| is
 // placed at the left side of P given by |parent_display_id|, with a negative
 // offset and a top-left offset reference.
 //
 //        +      +--------+
 // offset |      |        |
 //        +      |   D    +--------+
 //               |        |        |
@@ skipping 44 matching lines @@
 
 class DISPLAY_EXPORT DisplayLayout final {
  public:
   DisplayLayout();
   ~DisplayLayout();
 
   // Applies the layout to the displays in |display_list|.
   // |updated_ids| (optional) contains the ids for displays whose bounds have
   // changed. |minimum_offset_overlap| represents the minimum required overlap
   // between displays.
-  void ApplyToDisplayList(DisplayList* display_list,
+  void ApplyToDisplayList(Displays* display_list,
                           std::vector<int64_t>* updated_ids,
                           int minimum_offset_overlap) const;
 
   // Validates the layout object.
   static bool Validate(const DisplayIdList& list, const DisplayLayout& layout);
 
   std::vector<DisplayPlacement> placement_list;
 
   // True if displays are mirrored.
   bool mirrored;
@@ skipping 14 matching lines @@
   std::string ToString() const;
 
   // Returns the DisplayPlacement entry matching |display_id| if it exists,
   // otherwise returns a DisplayPlacement with an invalid display id.
   DisplayPlacement FindPlacementById(int64_t display_id) const;
 
  private:
   // Apply the display placement to |display_list|.
   // Returns true if the display bounds were updated.
   static bool ApplyDisplayPlacement(const DisplayPlacement& placement,
-                                    DisplayList* display_list,
+                                    Displays* display_list,
                                     int minimum_offset_overlap);
 
   DISALLOW_COPY_AND_ASSIGN(DisplayLayout);
 };
 
 }  // namespace display
 
 #endif  // UI_DISPLAY_MANAGER_DISPLAY_LAYOUT_H_