MacViews: Implemented Drag & Drop

ui/views/cocoa/bridged_native_widget.h

Index: ui/views/cocoa/bridged_native_widget.h
diff --git a/ui/views/cocoa/bridged_native_widget.h b/ui/views/cocoa/bridged_native_widget.h
index e4df8e78faa70618d410ebea6d4e33daf9923193..a9e4a0886fd7094ad97c2ce132673bc0627894cd 100644
--- a/ui/views/cocoa/bridged_native_widget.h
+++ b/ui/views/cocoa/bridged_native_widget.h
@@ -17,6 +17,7 @@
 #include "ui/compositor/layer_owner.h"
 #import "ui/views/cocoa/bridged_native_widget_owner.h"
 #import "ui/views/cocoa/cocoa_mouse_capture_delegate.h"
+#import "ui/views/cocoa/cocoa_drag_drop_manager.h"
 #import "ui/views/focus/focus_manager.h"
 #include "ui/views/views_export.h"
 #include "ui/views/widget/widget.h"
@@ -171,6 +172,8 @@ class VIEWS_EXPORT BridgedNativeWidget
 
   TooltipManager* tooltip_manager() { return tooltip_manager_.get(); }
 
+  CocoaDragDropManager* drag_drop_manager() { return drag_drop_manager_.get(); }
+
   // The parent widget specified in Widget::InitParams::parent. If non-null, the
   // parent will close children before the parent closes, and children will be
   // raised above their parent when window z-order changes.
@@ -263,6 +266,7 @@ class VIEWS_EXPORT BridgedNativeWidget
   std::unique_ptr<ui::InputMethod> input_method_;
   std::unique_ptr<CocoaMouseCapture> mouse_capture_;
   std::unique_ptr<TooltipManager> tooltip_manager_;
+  std::unique_ptr<CocoaDragDropManager> drag_drop_manager_;
   FocusManager* focus_manager_;  // Weak. Owned by our Widget.
   Widget::InitParams::Type widget_type_;