Mac/Linux: Ensure window size constraints propagate to the window server during Init

ui/views/test/widget_test_aura.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/views/test/widget_test.h"
 
 #include "ui/aura/window.h"
 #include "ui/aura/window_tree_host.h"
 #include "ui/views/widget/widget.h"
 
+#if defined(USE_X11)
+#include <X11/Xutil.h>
+#include "ui/gfx/x/x11_types.h"
+#endif
+
 namespace views {
 namespace test {
 
 namespace {
 
 // Perform a pre-order traversal of |children| and all descendants, looking for
 // |first| and |second|. If |first| is found before |second|, return true.
 // When a layer is found, it is set to null. Returns once |second| is found, or
 // when there are no children left.
 // Note that ui::Layer children are bottom-to-top stacking order.
@@ skipping 38 matching lines @@
 
   ui::Layer* root_layer = above->GetNativeWindow()->GetRootWindow()->layer();
 
   // Traversal is bottom-to-top, so |below| should be found first.
   const ui::Layer* first = below->GetLayer();
   const ui::Layer* second = above->GetLayer();
   return FindLayersInOrder(root_layer->children(), &first, &second);
 }
 
 // static
+gfx::Size WidgetTest::GetNativeWidgetMinimumContentSize(Widget* widget) {
+  // On Windows, HWNDMessageHandler receives a WM_GETMINMAXINFO message whenever
+  // the window manager is interested in knowing the size constraints. On
+  // ChromeOS, it's handled internally. Elsewhere, the size constraints need to
+  // be pushed to the window server when they change.
+#if defined(OS_CHROMEOS) || defined(OS_WIN)
+  return widget->GetNativeWindow()->delegate()->GetMinimumSize();
+#elif defined(USE_X11)
+  XSizeHints hints;
+  long supplied_return;
+  XGetWMNormalHints(
+      gfx::GetXDisplay(),
+      widget->GetNativeWindow()->GetHost()->GetAcceleratedWidget(), &hints,
+      &supplied_return);
+  return gfx::Size(hints.min_width, hints.min_height);
+#else
+  NOTREACHED();
+#endif
+}
+
+// static
 ui::EventProcessor* WidgetTest::GetEventProcessor(Widget* widget) {
   return widget->GetNativeWindow()->GetHost()->event_processor();
 }
 
 }  // namespace test
 }  // namespace views