Makes windowmanager draw non-client area

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 <set>
 #include <string>
 
 #include "base/bind.h"
@@ skipping 196 matching lines @@
   const bool can_change = OwnsWindow(connection_, this) || is_root;
   if (!can_change)
     return;
   if (bounds_ == bounds)
     return;
   if (connection_)
     static_cast<WindowTreeClientImpl*>(connection_)->SetBounds(id_, bounds);
   LocalSetBounds(bounds_, bounds);
 }
 
-void Window::SetClientArea(const gfx::Rect& client_area) {
+void Window::SetClientArea(const gfx::Insets& client_area) {
   if (!OwnsWindow(connection_, this) && !IsConnectionRoot(this))
     return;
 
   if (connection_) {
     static_cast<WindowTreeClientImpl*>(connection_)
         ->SetClientArea(id_, client_area);
   }
   LocalSetClientArea(client_area);
 }
 
@@ skipping 300 matching lines @@
 bool Window::LocalReorder(Window* relative, mojom::OrderDirection direction) {
   return ReorderImpl(&parent_->children_, this, relative, direction);
 }
 
 void Window::LocalSetBounds(const gfx::Rect& old_bounds,
                             const gfx::Rect& new_bounds) {
   // If this client owns the window, then it should be the only one to change
   // the bounds.
   DCHECK(!OwnsWindow(connection_, this) || old_bounds == bounds_);
   ScopedSetBoundsNotifier notifier(this, old_bounds, new_bounds);
-  if (bounds_.size() != new_bounds.size())
-    client_area_ = gfx::Rect(new_bounds.size());
   bounds_ = new_bounds;
 }
 
-void Window::LocalSetClientArea(const gfx::Rect& new_client_area) {
-  const gfx::Rect old_client_area = client_area_;
+void Window::LocalSetClientArea(const gfx::Insets& new_client_area) {
+  const gfx::Insets old_client_area = client_area_;
   client_area_ = new_client_area;
   FOR_EACH_OBSERVER(WindowObserver, observers_,
                     OnWindowClientAreaChanged(this, old_client_area));
 }
 
 void Window::LocalSetViewportMetrics(
     const mojom::ViewportMetrics& old_metrics,
     const mojom::ViewportMetrics& new_metrics) {
   // TODO(eseidel): We could check old_metrics against viewport_metrics_.
   viewport_metrics_ = new_metrics.Clone();
@@ skipping 109 matching lines @@
       !static_cast<WindowTreeClientImpl*>(connection_)->is_embed_root()) {
     return false;
   }
 
   while (!children_.empty())
     RemoveChild(children_[0]);
   return true;
 }
 
 }  // namespace mus