Add display::GetDisplayNearestView

ui/display/win/screen_win.cc

 // 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.
 
 #include "ui/display/win/screen_win.h"
 
 #include <windows.h>
 #include <shellscalingapi.h>
 
 #include <algorithm>
@@ skipping 388 matching lines @@
     // When |window| isn't rooted to a display, we should just return the
     // default display so we get some correct display information like the
     // scaling factor.
     return GetPrimaryDisplay();
   }
   ScreenWinDisplay screen_win_display =
       GetScreenWinDisplayNearestHWND(window_hwnd);
   return screen_win_display.display();
 }
 
+Display GetDisplayNearestView(gfx::NativeView view) const {
+  HWND window_hwnd = GetHWNDFromNativeView(view);
+  if (!window_hwnd) {
+    return GetPrimaryDisplay();
+  }
+  ScreenWinDisplay screen_win_display =
+      GetScreenWinDisplayNearestHWND(window_hwnd);
+  return screen_win_display.display();
+}

[tapted, 2017/03/09 00:47:42]

This is identical to GetDisplayNearestWindow. Is there a configuration on
windows where screen_aura.cc is not included in the build? I think we just need
to rename GetDisplayNearestWindow -> GetDisplayNearestView above so that aura's
WindowForView is used.

[Jinsuk Kim, 2017/03/09 01:56:17]

Right this is not necessary since Windows always uses aura. Works fine without
overriding this method. Will remove it in the next patch.

+
 Display ScreenWin::GetDisplayNearestPoint(const gfx::Point& point) const {
   gfx::Point screen_point(DIPToScreenPoint(point));
   ScreenWinDisplay screen_win_display =
       GetScreenWinDisplayNearestScreenPoint(screen_point);
   return screen_win_display.display();
 }
 
 Display ScreenWin::GetDisplayMatching(const gfx::Rect& match_rect) const {
   ScreenWinDisplay screen_win_display =
       GetScreenWinDisplayNearestScreenRect(match_rect);
@@ skipping 173 matching lines @@
     if (std::find(unique_scale_factors.begin(), unique_scale_factors.end(),
                   reported_scale) == unique_scale_factors.end()) {
       unique_scale_factors.push_back(reported_scale);
       UMA_HISTOGRAM_SPARSE_SLOWLY("UI.DeviceScale", reported_scale);
     }
   }
 }
 
 }  // namespace win
 }  // namespace display