MacViews: Fix failing mouse capture unittests.

ui/views/widget/native_widget_mac.mm

Index: ui/views/widget/native_widget_mac.mm
diff --git a/ui/views/widget/native_widget_mac.mm b/ui/views/widget/native_widget_mac.mm
index 8050abe94f08fe16982cf983f44e2b62c248ab7b..eca39288062e0879223f1fe06ce9f511a40c14f2 100644
--- a/ui/views/widget/native_widget_mac.mm
+++ b/ui/views/widget/native_widget_mac.mm
@@ -20,6 +20,7 @@
 #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"
@@ -725,8 +726,7 @@ gfx::FontList NativeWidgetPrivate::GetWindowTitleFontList() {
 // static
 gfx::NativeView NativeWidgetPrivate::GetGlobalCapture(
     gfx::NativeView native_view) {

[karandeepb, 2016/06/24 06:07:19]

It seems strange that this accepts a |native_view| parameter. Isn't it the case
that only one aura window can have capture at a time. Then there should be no
reason for this to accept a |native_view| parameter. 

Looks like this is needed because CaptureClient can't have a static
GetGlobalCaptureWindow method.

-  NOTIMPLEMENTED();
-  return nullptr;
+  return [CocoaMouseCapture::GetGlobalCaptureWindow() contentView];
 }
 
 }  // namespace internal