Refactors std::vector<Display> out of ScreenMus

ui/views/mus/screen_mus.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_VIEWS_MUS_SCREEN_MUS_H_
 #define UI_VIEWS_MUS_SCREEN_MUS_H_
 
 #include <vector>
 
 #include "base/observer_list.h"
 #include "base/run_loop.h"
 #include "components/mus/public/interfaces/display.mojom.h"
 #include "mojo/public/cpp/bindings/binding.h"
 #include "ui/display/display.h"
 #include "ui/display/screen.h"
+#include "ui/views/mus/display_list.h"
 #include "ui/views/mus/mus_export.h"
 
 namespace shell {
 class Connector;
 }
 
 namespace views {
 
 class ScreenMusDelegate;
 
 // Screen implementation backed by mus::mojom::DisplayManager.
 class VIEWS_MUS_EXPORT ScreenMus
     : public display::Screen,
       public NON_EXPORTED_BASE(mus::mojom::DisplayManagerObserver) {
  public:
   // |delegate| can be nullptr.
   explicit ScreenMus(ScreenMusDelegate* delegate);
   ~ScreenMus() override;
 
   void Init(shell::Connector* connector);
 
  private:
-  int FindDisplayIndexById(int64_t id) const;
-
   // Invoked when a display changed in some weay, including being added.
   // If |is_primary| is true, |changed_display| is the primary display.
   void ProcessDisplayChanged(const display::Display& changed_display,
                              bool is_primary);
 
   // display::Screen:
   gfx::Point GetCursorScreenPoint() override;
   bool IsWindowUnderCursor(gfx::NativeWindow window) override;
   gfx::NativeWindow GetWindowAtScreenPoint(const gfx::Point& point) override;
   display::Display GetPrimaryDisplay() const override;
   display::Display GetDisplayNearestWindow(gfx::NativeView view) const override;
   display::Display GetDisplayNearestPoint(
       const gfx::Point& point) const override;
   int GetNumDisplays() const override;
   std::vector<display::Display> GetAllDisplays() const override;
   display::Display GetDisplayMatching(
       const gfx::Rect& match_rect) const override;
   void AddObserver(display::DisplayObserver* observer) override;
   void RemoveObserver(display::DisplayObserver* observer) override;
 
   // mus::mojom::DisplayManager:
-  void OnDisplays(mojo::Array<mus::mojom::DisplayPtr> displays) override;
-  void OnDisplaysChanged(mojo::Array<mus::mojom::DisplayPtr> display) override;
+  void OnDisplays(
+      mojo::Array<mus::mojom::DisplayPtr> transport_displays) override;
+  void OnDisplaysChanged(
+      mojo::Array<mus::mojom::DisplayPtr> transport_displays) override;
   void OnDisplayRemoved(int64_t id) override;
 
   ScreenMusDelegate* delegate_;  // Can be nullptr.
   mus::mojom::DisplayManagerPtr display_manager_;
-  std::vector<display::Display> displays_;
-  int primary_display_index_;
   mojo::Binding<mus::mojom::DisplayManagerObserver>
       display_manager_observer_binding_;
-  base::ObserverList<display::DisplayObserver> observers_;
+  DisplayList display_list_;
 
   DISALLOW_COPY_AND_ASSIGN(ScreenMus);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_MUS_SCREEN_MUS_H_