Add IPCs to check web copy/cut/paste for extensions with the appropriate permission bit.

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 2369 matching lines @@
 
 // Updates the minimum/maximum allowed zoom percent for this tab from the
 // default values.  If |remember| is true, then the zoom setting is applied to
 // other pages in the site and is saved, otherwise it only applies to this
 // tab.
 IPC_MESSAGE_ROUTED3(ViewHostMsg_UpdateZoomLimits,
                     int /* minimum_percent */,
                     int /* maximum_percent */,
                     bool /* remember */)
 
+IPC_SYNC_MESSAGE_ROUTED0_1(ViewHostMsg_IsWebCopyCutEnabled,

[Aaron Boodman, 2011/02/16 21:52:34]

This looks like a synchronous message to the browser's UI thread. Such messages
are disallowed because they can deadlock the browser.

You can only do synchronous messages to the browser's IO thread.

Extensions are accessible on the IO thread (they are immutable), so you can just
move this code there. I think ChromeURLRequestContext would be the right place.
There is other code that checks extension permissions there, eg for Geolocation.

[dcheng, 2011/02/18 06:38:33]

I've moved this to RenderMessageFilter. I'm not 100% what I've done is correct,
but I haven't had time to wire up the WebKit side. It compiles at least. I will
test this change before landing the patch of course =)

+                           bool /* enabled */)
+
+IPC_SYNC_MESSAGE_ROUTED0_1(ViewHostMsg_IsWebPasteEnabled,
+                           bool /* enabled */)
+
 //---------------------------------------------------------------------------
 // Device orientation services messages:
 
 // A RenderView requests to start receiving device orientation updates.
 IPC_MESSAGE_CONTROL1(ViewHostMsg_DeviceOrientation_StartUpdating,
                      int /* render_view_id */)
 
 // A RenderView requests to stop receiving device orientation updates.
 IPC_MESSAGE_CONTROL1(ViewHostMsg_DeviceOrientation_StopUpdating,
                      int /* render_view_id */)
@@ skipping 126 matching lines @@
 // The currently displayed PDF has an unsupported feature.
 IPC_MESSAGE_ROUTED0(ViewHostMsg_PDFHasUnsupportedFeature)
 
 // 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 */)