MacViews: Implemented Drag & Drop

ui/views/cocoa/bridged_content_view.h

 // 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.
 
 #ifndef UI_VIEWS_COCOA_BRIDGED_CONTENT_VIEW_H_
 #define UI_VIEWS_COCOA_BRIDGED_CONTENT_VIEW_H_
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/strings/string16.h"
 #import "ui/base/cocoa/tool_tip_base_view.h"
 #import "ui/base/cocoa/tracking_area.h"
 
 namespace ui {
 class TextInputClient;
 }
 
 namespace views {
 class View;
 }
 
 // The NSView that sits as the root contentView of the NSWindow, whilst it has
 // a views::RootView present. Bridges requests from Cocoa to the hosted
 // views::View.
-@interface BridgedContentView
-    : ToolTipBaseView<NSTextInputClient, NSUserInterfaceValidations> {
+@interface BridgedContentView : ToolTipBaseView<NSTextInputClient,
+                                                NSUserInterfaceValidations,
+                                                NSDraggingSource> {
  @private
   // Weak. The hosted RootView, owned by hostedView_->GetWidget().
   views::View* hostedView_;
 
   // Weak. If non-null the TextInputClient of the currently focused View in the
   // hierarchy rooted at |hostedView_|. Owned by the focused View.
   ui::TextInputClient* textInputClient_;
 
   // A tracking area installed to enable mouseMoved events.
   ui::ScopedCrTrackingArea cursorTrackingArea_;
@@ skipping 42 matching lines @@
 // Update windowMask_ depending on the current view bounds.
 - (void)updateWindowMask;
 
 // Notifies the associated FocusManager whether full keyboard access is enabled
 // or not.
 - (void)updateFullKeyboardAccess;
 
 @end
 
 #endif  // UI_VIEWS_COCOA_BRIDGED_CONTENT_VIEW_H_