Add GetDisplayWithDisplayId to display::Screen.

ui/display/screen.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 UI_DISPLAY_SCREEN_H_
 #define UI_DISPLAY_SCREEN_H_
 
 #include <vector>
 
 #include "base/macros.h"
@@ skipping 37 matching lines @@
   virtual gfx::NativeWindow GetWindowAtScreenPoint(const gfx::Point& point) = 0;
 
   // Returns the number of displays.
   // Mirrored displays are excluded; this method is intended to return the
   // number of distinct, usable displays.
   virtual int GetNumDisplays() const = 0;
 
   // Returns the list of displays that are currently available.
   virtual std::vector<display::Display> GetAllDisplays() const = 0;
 
+  // Returns true if the display with |display_id| is found and returns that

[sky, 2016/10/06 15:20:03]

Is there a reason this can't be made a helper function and not a pure virtual
function of this class? Doesn't iterating over GetAllDisplays() give you what
you need?

[riajiang, 2016/10/06 18:26:31]

We were thinking to change some subclasses of display::Screen to use ScreenBase
instead to make use of the DisplayList in ScreenBase and to avoid similar code
in those subclasses. DisplayList already has a FindDisplayById(). And
GetAllDisplays() would make a copy. What do you think?

[sky, 2016/10/06 21:28:34]

That seems orthogonal. You could change subclasses to use DisplayList regardless
of this change.
I am more in favor of making GetAllDisplays() return a const vector& and move
this function else where. That makes it easier for subclasses to implement
Screen. WDYT?

+  // display in |display|. Otherwise returns false and |display| remains
+  // untouched.
+  virtual bool GetDisplayWithDisplayId(int64_t display_id,
+                                       display::Display* display) const = 0;
+
   // Returns the display nearest the specified window.
   // If the window is NULL or the window is not rooted to a display this will
   // return the primary display.
   virtual display::Display GetDisplayNearestWindow(
       gfx::NativeView view) const = 0;
 
   // Returns the display nearest the specified point. |point| should be in DIPs.
   virtual display::Display GetDisplayNearestPoint(
       const gfx::Point& point) const = 0;
 
@@ skipping 22 matching lines @@
 
  private:
   DISALLOW_COPY_AND_ASSIGN(Screen);
 };
 
 Screen* CreateNativeScreen();
 
 }  // namespace display
 
 #endif  // UI_DISPLAY_SCREEN_H_