Random wm frame painting fixes

components/mus/public/cpp/lib/window.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 "components/mus/public/cpp/window.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <set>
@@ skipping 298 matching lines @@
     return;
   Reorder(parent_->children_.back(), mojom::OrderDirection::ABOVE);
 }
 
 void Window::MoveToBack() {
   if (!parent_ || parent_->children_.front() == this)
     return;
   Reorder(parent_->children_.front(), mojom::OrderDirection::BELOW);
 }
 
-bool Window::Contains(Window* child) const {
+bool Window::Contains(const Window* child) const {
   if (!child)
     return false;
   if (child == this)
     return true;
   if (connection_)
-    CHECK_EQ(child->connection(), connection_);
-  for (Window* p = child->parent(); p; p = p->parent()) {
+    CHECK_EQ(child->connection_, connection_);
+  for (const Window* p = child->parent(); p; p = p->parent()) {
     if (p == this)
       return true;
   }
   return false;
 }
 
 void Window::AddTransientWindow(Window* transient_window) {
   if (connection_)
     CHECK_EQ(transient_window->connection(), connection_);
   LocalAddTransientWindow(transient_window);
@@ skipping 501 matching lines @@
     notifier->NotifyWindowReordered();
 
   return true;
 }
 
 // static
 Window** Window::GetStackingTarget(Window* window) {
   return &window->stacking_target_;
 }
 }  // namespace mus