Move the core drag&drop code for Windows to content\browser to match Mac/GTK. I've had to add tempo…

chrome/browser/tab_contents/web_drop_target_win.h

-// Copyright (c) 2011 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 CHROME_BROWSER_TAB_CONTENTS_WEB_DROP_TARGET_WIN_H_
-#define CHROME_BROWSER_TAB_CONTENTS_WEB_DROP_TARGET_WIN_H_
-#pragma once
-
-#include "base/memory/scoped_ptr.h"
-#include "third_party/WebKit/Source/WebKit/chromium/public/WebDragOperation.h"
-#include "ui/base/dragdrop/drop_target.h"
-
-class InterstitialDropTarget;
-class RenderViewHost;
-
-namespace content {
-class WebContents;
-class WebDragDestDelegate;
-}
-
-// A helper object that provides drop capabilities to a TabContents. The
-// DropTarget handles drags that enter the region of the WebContents by
-// passing on the events to the renderer.
-class WebDropTarget : public ui::DropTarget {
- public:
-  // Create a new WebDropTarget associating it with the given HWND and
-  // WebContents.
-  WebDropTarget(HWND source_hwnd, content::WebContents* contents);
-  virtual ~WebDropTarget();
-
-  void set_drag_cursor(WebKit::WebDragOperation op) {
-    drag_cursor_ = op;
-  }
-
-  content::WebDragDestDelegate* delegate() const { return delegate_; }
-  void set_delegate(content::WebDragDestDelegate* d) { delegate_ = d; }
-
- protected:
-  virtual DWORD OnDragEnter(IDataObject* data_object,
-                            DWORD key_state,
-                            POINT cursor_position,
-                            DWORD effect);
-
-  virtual DWORD OnDragOver(IDataObject* data_object,
-                           DWORD key_state,
-                           POINT cursor_position,
-                           DWORD effect);
-
-  virtual void OnDragLeave(IDataObject* data_object);
-
-  virtual DWORD OnDrop(IDataObject* data_object,
-                       DWORD key_state,
-                       POINT cursor_position,
-                       DWORD effect);
-
- private:
-  // Our associated WebContents.
-  content::WebContents* web_contents_;
-
-  // We keep track of the render view host we're dragging over.  If it changes
-  // during a drag, we need to re-send the DragEnter message.  WARNING:
-  // this pointer should never be dereferenced.  We only use it for comparing
-  // pointers.
-  RenderViewHost* current_rvh_;
-
-  // Used to determine what cursor we should display when dragging over web
-  // content area.  This can be updated async during a drag operation.
-  WebKit::WebDragOperation drag_cursor_;
-
-  // A special drop target handler for when we try to d&d while an interstitial
-  // page is showing.
-  scoped_ptr<InterstitialDropTarget> interstitial_drop_target_;
-
-  // A delegate that can receive drag information about drag events.
-  content::WebDragDestDelegate* delegate_;
-
-  DISALLOW_COPY_AND_ASSIGN(WebDropTarget);
-};
-
-#endif  // CHROME_BROWSER_TAB_CONTENTS_WEB_DROP_TARGET_WIN_H_