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

chrome/common/render_messages_internal.h

Index: chrome/common/render_messages_internal.h
diff --git a/chrome/common/render_messages_internal.h b/chrome/common/render_messages_internal.h
index 49ab92881ca02ed50169133ab694d5a256bd4784..1100a1f405a8ed4660d20cd6548cf95e931b6712 100644
--- a/chrome/common/render_messages_internal.h
+++ b/chrome/common/render_messages_internal.h
@@ -2387,6 +2387,12 @@ IPC_MESSAGE_ROUTED3(ViewHostMsg_UpdateZoomLimits,
                     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: