Draggable region support for frameless app window on Windows.

content/common/view_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 page rendering.
 // Multiply-included message file, hence no include guard.
 
 #include "base/process.h"
 #include "base/shared_memory.h"
 #include "content/common/content_export.h"
 #include "content/common/css_colors.h"
 #include "content/common/edit_command.h"
 #include "content/common/navigation_gesture.h"
 #include "content/common/view_message_enums.h"
 #include "content/public/common/common_param_traits.h"
 #include "content/public/common/context_menu_params.h"
+#include "content/public/common/draggable_region.h"
 #include "content/public/common/file_chooser_params.h"
 #include "content/public/common/frame_navigate_params.h"
 #include "content/public/common/javascript_message_type.h"
 #include "content/public/common/page_zoom.h"
 #include "content/public/common/referrer.h"
 #include "content/public/common/renderer_preferences.h"
 #include "content/public/common/stop_find_action.h"
 #include "content/public/common/webkit_param_traits.h"
 #include "content/public/common/window_container_type.h"
 #include "ipc/ipc_channel_handle.h"
@@ skipping 2151 matching lines @@
 // (according to the value of is_hung). The browser can give the user the
 // option of killing the plugin.
 IPC_MESSAGE_ROUTED3(ViewHostMsg_PepperPluginHung,
                     int /* plugin_child_id */,
                     FilePath /* path */,
                     bool /* is_hung */)
 
 // Screen was rotated. Dispatched to the onorientationchange javascript API.
 IPC_MESSAGE_ROUTED1(ViewMsg_OrientationChangeEvent,
                     int /* orientation */)
+
+// Sent to the browser to update the draggable regions
+IPC_MESSAGE_ROUTED1(ViewHostMsg_UpdateDraggableRegions,
+                    std::vector<content::DraggableRegion> /* regions */)

[jeremya, 2012/08/07 01:00:17]

I talked with jamesr a while ago about the best way to do this, and he suggested
maybe sending the draggable region data along with the UpdateRect message (which
include among other things plugin window move information). I think doing it
that way would guarantee that the draggable regions would always be in sync with
the pixels.

This way is fine for now, but it might be good to think about merging this
message with UpdateRect :)