browser-plugin: Allow accepting drag-n-drop events.

content/browser/browser_plugin/browser_plugin_guest_helper.h

 // Copyright (c) 2012 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 CONTENT_BROWSER_BROWSER_PLUGIN_BROWSER_PLUGIN_GUEST_HELPER_H_
 #define CONTENT_BROWSER_BROWSER_PLUGIN_BROWSER_PLUGIN_GUEST_HELPER_H_
 
 #include "content/public/browser/render_view_host_observer.h"
 #include "content/public/browser/notification_registrar.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebDragOperation.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebInputEvent.h"
 
 class WebCursor;
 struct ViewHostMsg_UpdateRect_Params;
 
 namespace gfx {
 class Size;
 }
 
 namespace content {
@@ skipping 15 matching lines @@
   BrowserPluginGuestHelper(BrowserPluginGuest* guest,
                            RenderViewHost* render_view_host);
   virtual ~BrowserPluginGuestHelper();
 
  protected:
   // RenderViewHostObserver implementation.
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
 
  private:
   // Message handlers
+  void OnUpdateDragCursor(WebKit::WebDragOperation current_op);
   void OnUpdateRect(const ViewHostMsg_UpdateRect_Params& params);
   void OnHandleInputEventAck(WebKit::WebInputEvent::Type event_type,
                              bool processed);
   void OnTakeFocus(bool reverse);
   void OnShowWidget(int route_id, const gfx::Rect& initial_pos);
   void OnMsgHasTouchEventHandlers(bool has_handlers);
   void OnSetCursor(const WebCursor& cursor);
 
   BrowserPluginGuest* guest_;
   // A scoped container for notification registries.
   NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserPluginGuestHelper);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_BROWSER_PLUGIN_BROWSER_PLUGIN_GUEST_HELPER_H_