PoC: Using the toolkit-views fullscreen access bubble on Mac

ui/views/cocoa/bridged_native_widget.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.
 
 #import "ui/views/cocoa/bridged_native_widget.h"
 
 #import <objc/runtime.h>
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 410 matching lines @@
   Widget* widget = native_widget_mac_->GetWidget();
   // -[NSWindow contentMinSize] is only checked by Cocoa for user-initiated
   // resizes. This is not what toolkit-views expects, so clamp. Note there is
   // no check for maximum size (consistent with aura::Window::SetBounds()).
   gfx::Size clamped_content_size =
       GetClientSizeForWindowSize(window_, new_bounds.size());
   clamped_content_size.SetToMax(widget->GetMinimumSize());
 
   // A contentRect with zero width or height is a banned practice in ChromeMac,
   // due to unpredictable OSX treatment.
-  DCHECK(!clamped_content_size.IsEmpty())
-      << "Zero-sized windows not supported on Mac";
+  // DCHECK(!clamped_content_size.IsEmpty())
+  //    << "Zero-sized windows not supported on Mac";
 
   if (!window_visible_ && native_widget_mac_->IsWindowModalSheet()) {
     // Window-Modal dialogs (i.e. sheets) are positioned by Cocoa when shown for
     // the first time. They also have no frame, so just update the content size.
     [window_ setContentSize:NSMakeSize(clamped_content_size.width(),
                                        clamped_content_size.height())];
     return;
   }
   gfx::Rect actual_new_bounds(
       new_bounds.origin(),
@@ skipping 768 matching lines @@
   [bridged_view_ setMouseDownCanMoveWindow:draggable];
   // AppKit will not update its cache of mouseDownCanMoveWindow unless something
   // changes. Previously we tried adding an NSView and removing it, but for some
   // reason it required reposting the mouse-down event, and didn't always work.
   // Calling the below seems to be an effective solution.
   [window_ setMovableByWindowBackground:NO];
   [window_ setMovableByWindowBackground:YES];
 }
 
 }  // namespace views