MacViews: Gets a webview working in views_examples_with_content_exe

ui/views/widget/native_widget_mac.mm

 // 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/widget/native_widget_mac.h"
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/mac/foundation_util.h"
 #include "base/mac/scoped_nsobject.h"
@@ skipping 569 matching lines @@
 
 // static
 void NativeWidgetPrivate::GetAllOwnedWidgets(gfx::NativeView native_view,
                                              Widget::Widgets* owned) {
   NOTIMPLEMENTED();
 }
 
 // static
 void NativeWidgetPrivate::ReparentNativeView(gfx::NativeView native_view,
                                              gfx::NativeView new_parent) {
-  NOTIMPLEMENTED();
+  DCHECK_NE(native_view, new_parent);
+
+  gfx::NativeView old_parent = [native_view superview];
+  if (old_parent == new_parent)
+    return;
+
+  // On Mac, changing the native view heirarchy will affect at most two Widgets.
+  NativeWidgetPrivate* old_parent_widget =
+      GetNativeWidgetForNativeView(native_view);
+  NativeWidgetPrivate* new_parent_widget =
+      GetNativeWidgetForNativeView(new_parent);
+
+  if (old_parent_widget == new_parent_widget)
+    old_parent_widget = NULL;
+  if (old_parent_widget)
+    old_parent_widget->GetWidget()->NotifyNativeViewHierarchyWillChange();
+  if (new_parent_widget)
+    new_parent_widget->GetWidget()->NotifyNativeViewHierarchyWillChange();
+
+  [native_view removeFromSuperview];
+
+  if (new_parent)
+    [new_parent addSubview:native_view];
+
+  if (old_parent_widget)
+    old_parent_widget->GetWidget()->NotifyNativeViewHierarchyChanged();
+  if (new_parent_widget)
+    new_parent_widget->GetWidget()->NotifyNativeViewHierarchyChanged();
 }
 
 // static
 bool NativeWidgetPrivate::IsMouseButtonDown() {
   return [NSEvent pressedMouseButtons] != 0;
 }
 
 // static
 gfx::FontList NativeWidgetPrivate::GetWindowTitleFontList() {
   NOTIMPLEMENTED();
   return gfx::FontList();
 }
 
 }  // namespace internal
 }  // namespace views