MacViews: Fix failing mouse capture unittests.

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 <utility>
 
 #include "base/mac/foundation_util.h"
 #include "base/mac/scoped_nsobject.h"
 #include "base/strings/sys_string_conversions.h"
 #import "ui/base/cocoa/constrained_window/constrained_window_animation.h"
 #import "ui/base/cocoa/window_size_constants.h"
 #include "ui/gfx/font_list.h"
 #import "ui/gfx/mac/coordinate_conversion.h"
 #import "ui/gfx/mac/nswindow_frame_controls.h"
 #include "ui/native_theme/native_theme.h"
 #include "ui/native_theme/native_theme_mac.h"
 #import "ui/views/cocoa/bridged_content_view.h"
 #import "ui/views/cocoa/bridged_native_widget.h"
+#include "ui/views/cocoa/cocoa_mouse_capture.h"
 #import "ui/views/cocoa/drag_drop_client_mac.h"
 #import "ui/views/cocoa/native_widget_mac_nswindow.h"
 #import "ui/views/cocoa/views_nswindow_delegate.h"
 #include "ui/views/widget/drop_helper.h"
 #include "ui/views/widget/widget_delegate.h"
 #include "ui/views/window/native_frame_view.h"
 
 // Self-owning animation delegate that starts a hide animation, then calls
 // -[NSWindow close] when the animation ends, releasing itself.
 @interface ViewsNSWindowCloseAnimator : NSObject<NSAnimationDelegate> {
@@ skipping 685 matching lines @@
 
 // static
 gfx::FontList NativeWidgetPrivate::GetWindowTitleFontList() {
   NOTIMPLEMENTED();
   return gfx::FontList();
 }
 
 // static
 gfx::NativeView NativeWidgetPrivate::GetGlobalCapture(
     gfx::NativeView native_view) {
-  NOTIMPLEMENTED();
-  return nullptr;
+  return [CocoaMouseCapture::GetGlobalCaptureWindow() contentView];
 }
 
 }  // namespace internal
 }  // namespace views
 
 @implementation ViewsNSWindowCloseAnimator
 
 - (id)initWithWindow:(NSWindow*)window {
   if ((self = [super init])) {
     window_.reset([window retain]);
@@ skipping 10 matching lines @@
   [[ViewsNSWindowCloseAnimator alloc] initWithWindow:window];
 }
 
 - (void)animationDidEnd:(NSAnimation*)animation {
   [window_ close];
   [animation_ setDelegate:nil];
   [self release];
 }
 
 @end