Add GetDisplayWithDisplayId to display::Screen.

ui/display/ios/screen_ios.mm

Index: ui/display/ios/screen_ios.mm
diff --git a/ui/display/ios/screen_ios.mm b/ui/display/ios/screen_ios.mm
index 08d0d921b171106439039de2e348b1aadea7c064..83fc021fb103328444a28cde157f9c716e8c521f 100644
--- a/ui/display/ios/screen_ios.mm
+++ b/ui/display/ios/screen_ios.mm
@@ -42,6 +42,16 @@ class ScreenIos : public Screen {
     return std::vector<Display>(1, GetPrimaryDisplay());
   }
 
+  // Returns the display with |display_id|.
+  bool GetDisplayWithDisplayId(int64_t display_id,
+                               Display* display) const override {
+    if (display_id == 0) {
+      *display = GetPrimaryDisplay();
+      return true;
+    }
+    return false;
+  }
+
   // Returns the display nearest the specified window.
   Display GetDisplayNearestWindow(gfx::NativeView view) const override {
     NOTIMPLEMENTED();