ozone: dri: Support moving between displays in MoveCursorTo(location)

ui/ozone/platform/dri/dri_window_manager.cc

 // Copyright 2014 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/ozone/platform/dri/dri_window_manager.h"
 
 #include "base/logging.h"
 #include "ui/ozone/platform/dri/dri_cursor.h"
 #include "ui/ozone/platform/dri/dri_window.h"
 
@@ skipping 44 matching lines @@
 
 DriWindow* DriWindowManager::GetWindow(gfx::AcceleratedWidget widget) {
   WidgetToWindowMap::iterator it = window_map_.find(widget);
   if (it != window_map_.end())
     return it->second;
 
   NOTREACHED() << "Attempting to get non-existing window " << widget;
   return NULL;
 }
 
+DriWindow* DriWindowManager::GetWindowAt(const gfx::Point& location) {
+  for (auto it = window_map_.begin(); it != window_map_.end(); ++it)
+    if (it->second->GetBounds().Contains(location))
+      return it->second;
+
+  return NULL;
+}
+
 void DriWindowManager::ResetCursorLocation() {
   gfx::AcceleratedWidget cursor_widget = gfx::kNullAcceleratedWidget;
   gfx::PointF location;
   if (!window_map_.empty()) {
     WidgetToWindowMap::iterator it = window_map_.begin();
     cursor_widget = it->first;
     location = GetDefaultCursorLocation(it->second);
   }
 
   cursor_->MoveCursorTo(cursor_widget, location);
 }
 
 }  // namespace ui