Fix dropping images into content editable divs.

ui/base/dragdrop/cocoa_dnd_util.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 UI_BASE_DRAGDROP_MAC_DND_UTIL_H_
 #define UI_BASE_DRAGDROP_MAC_DND_UTIL_H_
 
 #import <Cocoa/Cocoa.h>
 
 #include <vector>
 
 #include "base/string16.h"
 #include "ui/base/ui_export.h"
 
 class GURL;
 
 namespace ui {
 
 // Dummy data type that Chrome places in dragging pasteboards. There is never
 // any data associated with this type; it's only used to ensure that Chrome
 // supports any drag initiated inside of Chrome, whether or not data has been
 // associated with it.
 UI_EXPORT extern NSString* const kChromeDragDummyPboardType;
 
+// Mail.app and TextEdit accept drags that have both HTML and image flavors on
+// them, but don't process them correctly <http://crbug.com/55879>. Therefore,
+// if there is an image flavor, don't put the HTML data on as HTML, but rather
+// put it on as this Chrome-only flavor. External apps won't see HTML but
+// Chrome will know enough to read it as HTML. <http://crbug.com/55879>
+UI_EXPORT extern NSString* const kChromeDragImageHTMLPboardType;
+
 // Populates the |url| and |title| with URL data in |pboard|. There may be more
 // than one, but we only handle dropping the first. |url| must not be |NULL|;
 // |title| is an optional parameter. Returns |YES| if URL data was obtained from
 // the pasteboard, |NO| otherwise. If |convert_filenames| is |YES|, the function
 // will also attempt to convert filenames in |pboard| to file URLs.
 UI_EXPORT BOOL PopulateURLAndTitleFromPasteboard(GURL* url,
                                                  string16* title,
                                                  NSPasteboard* pboard,
                                                  BOOL convert_filenames);
 
 }  // namespace ui
 
 #endif  // UI_BASE_DRAGDROP_MAC_DND_UTIL_H_