Handles users rotating screen too early

ui/display/manager/display_manager.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/manager/display_manager.h"
 
 #include <algorithm>
 #include <cmath>
 #include <limits>
 #include <map>
@@ skipping 247 matching lines @@
   for (int64_t id : updated_ids) {
     NotifyMetricsChanged(GetDisplayForId(id),
                          DisplayObserver::DISPLAY_METRIC_BOUNDS |
                              DisplayObserver::DISPLAY_METRIC_WORK_AREA);
   }
 
   if (delegate_)
     delegate_->PostDisplayConfigurationChange(false);
 }
 
-const Display& DisplayManager::GetDisplayForId(int64_t id) const {
-  Display* display = const_cast<DisplayManager*>(this)->FindDisplayForId(id);
+const Display& DisplayManager::GetDisplayForId(int64_t display_id) const {
+  Display* display =
+      const_cast<DisplayManager*>(this)->FindDisplayForId(display_id);
   return display ? *display : GetInvalidDisplay();
 }
 
+bool DisplayManager::IsDisplayIdValid(int64_t display_id) const {
+  return GetDisplayForId(display_id).is_valid();
+}
+
 const Display& DisplayManager::FindDisplayContainingPoint(
     const gfx::Point& point_in_screen) const {
   auto iter = display::FindDisplayContainingPoint(active_display_list_,
                                                   point_in_screen);
   return iter == active_display_list_.end() ? GetInvalidDisplay() : *iter;
 }
 
 bool DisplayManager::UpdateWorkAreaOfDisplay(int64_t display_id,
                                              const gfx::Insets& insets) {
   Display* display = FindDisplayForId(display_id);
@@ skipping 1168 matching lines @@
 }
 
 const Display& DisplayManager::GetSecondaryDisplay() const {
   CHECK_LE(2U, GetNumDisplays());
   return GetDisplayAt(0).id() == Screen::GetScreen()->GetPrimaryDisplay().id()
              ? GetDisplayAt(1)
              : GetDisplayAt(0);
 }
 
 }  // namespace display