Generate thumbnails in the browser process.

chrome/common/render_messages_internal.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.
 
 #include <map>
 #include <set>
 #include <string>
 #include <vector>
 
 #include "build/build_config.h"
@@ skipping 1261 matching lines @@
 // the tag sent along with ViewMsg_PaintAtSize.
 IPC_MESSAGE_ROUTED2(ViewHostMsg_PaintAtSize_ACK,
                     int /* tag */,
                     gfx::Size /* size */)
 
 // Sent to update part of the view.  In response to this message, the host
 // generates a ViewMsg_UpdateRect_ACK message.
 IPC_MESSAGE_ROUTED1(ViewHostMsg_UpdateRect,
                     ViewHostMsg_UpdateRect_Params)
 
+// Sent to update the current scroll offset.
+IPC_MESSAGE_ROUTED1(ViewHostMsg_UpdateScrollOffset, gfx::Size);
+
 // Sent by the renderer when accelerated compositing is enabled or disabled to
 // notify the browser whether or not is should do painting.
 IPC_MESSAGE_ROUTED1(ViewHostMsg_DidActivateAcceleratedCompositing,
                     bool /* true if the accelerated compositor is actve */)
 
 // Acknowledges receipt of a ViewMsg_HandleInputEvent message.
 // Payload is a WebInputEvent::Type which is the type of the event, followed
 // by an optional WebInputEvent which is provided only if the event was not
 // processed.
 IPC_MESSAGE_ROUTED0(ViewHostMsg_HandleInputEvent_ACK)
@@ skipping 1338 matching lines @@
                      int /* request_id */,
                      PP_Flash_NetAddress /* addr */)
 
 // JavaScript related messages -----------------------------------------------
 
 // Notify the JavaScript engine in the render to change its parameters
 // while performing stress testing.
 IPC_MESSAGE_ROUTED2(ViewMsg_JavaScriptStressTestControl,
                     int /* cmd */,
                     int /* param */)