Plumb event flags (shift/alt/ctrl modifiers) for drag/drop events to WebKit.

content/common/drag_messages.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.
 
 // IPC messages for drag and drop.
 // Multiply-included message file, hence no include guard.
 
 #include "content/public/common/common_param_traits.h"
 #include "ipc/ipc_message_macros.h"
 #include "third_party/skia/include/core/SkBitmap.h"
@@ skipping 19 matching lines @@
   IPC_STRUCT_TRAITS_MEMBER(plain_text)
   IPC_STRUCT_TRAITS_MEMBER(text_html)
   IPC_STRUCT_TRAITS_MEMBER(html_base_url)
   IPC_STRUCT_TRAITS_MEMBER(file_description_filename)
   IPC_STRUCT_TRAITS_MEMBER(file_contents)
   IPC_STRUCT_TRAITS_MEMBER(custom_data)
 IPC_STRUCT_TRAITS_END()
 
 // Messages sent from the browser to the renderer.
 
-IPC_MESSAGE_ROUTED4(DragMsg_TargetDragEnter,
+IPC_MESSAGE_ROUTED5(DragMsg_TargetDragEnter,
                     WebDropData /* drop_data */,
                     gfx::Point /* client_pt */,
                     gfx::Point /* screen_pt */,
-                    WebKit::WebDragOperationsMask /* ops_allowed */)
+                    WebKit::WebDragOperationsMask /* ops_allowed */,
+                    int /* key_modifiers */)
 
-IPC_MESSAGE_ROUTED3(DragMsg_TargetDragOver,
+IPC_MESSAGE_ROUTED4(DragMsg_TargetDragOver,
                     gfx::Point /* client_pt */,
                     gfx::Point /* screen_pt */,
-                    WebKit::WebDragOperationsMask /* ops_allowed */)
+                    WebKit::WebDragOperationsMask /* ops_allowed */,
+                    int /* key_modifiers */)
 
 IPC_MESSAGE_ROUTED0(DragMsg_TargetDragLeave)
 
-IPC_MESSAGE_ROUTED2(DragMsg_TargetDrop,
+IPC_MESSAGE_ROUTED3(DragMsg_TargetDrop,
                     gfx::Point /* client_pt */,
-                    gfx::Point /* screen_pt */)
+                    gfx::Point /* screen_pt */,
+                    int /* key_modifiers */)
 
 // Notifies the renderer of updates in mouse position of an in-progress
 // drag.  if |ended| is true, then the user has ended the drag operation.
 IPC_MESSAGE_ROUTED4(DragMsg_SourceEndedOrMoved,
                     gfx::Point /* client_pt */,
                     gfx::Point /* screen_pt */,
                     bool /* ended */,
                     WebKit::WebDragOperation /* drag_operation */)
 
 // Notifies the renderer that the system DoDragDrop call has ended.
@@ skipping 11 matching lines @@
                     SkBitmap /* image */,
                     gfx::Point /* image_offset */)
 
 // The page wants to update the mouse cursor during a drag & drop operation.
 // |is_drop_target| is true if the mouse is over a valid drop target.
 IPC_MESSAGE_ROUTED1(DragHostMsg_UpdateDragCursor,
                     WebKit::WebDragOperation /* drag_operation */)
 
 // Notifies the host that the renderer finished a drop operation.
 IPC_MESSAGE_ROUTED0(DragHostMsg_TargetDrop_ACK)