Use a placeholder instead of the default plugin for missing plug-ins on Mac and Linux.

content/common/view_messages.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.
 
 // 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/common_param_traits.h"
@@ skipping 1451 matching lines @@
 IPC_SYNC_MESSAGE_CONTROL2_1(ViewHostMsg_CookiesEnabled,
                             GURL /* url */,
                             GURL /* first_party_for_cookies */,
                             bool /* cookies_enabled */)
 
 // Used to get the list of plugins
 IPC_SYNC_MESSAGE_CONTROL1_1(ViewHostMsg_GetPlugins,
     bool /* refresh*/,
     std::vector<webkit::WebPluginInfo> /* plugins */)
 
 // Return information about a plugin for the given URL and MIME

[jam, 2011/09/27 16:51:34]

nit: update comment

[Bernhard Bauer, 2011/09/29 13:20:47]

Done.

 // type. If there is no matching plugin, |found| is false.
 // |actual_mime_type| is the actual mime type supported by the
 // plugin found that match the URL given (one for each item in
 // |info|).
-IPC_SYNC_MESSAGE_CONTROL4_3(ViewHostMsg_GetPluginInfo,
+IPC_SYNC_MESSAGE_CONTROL4_3(ViewHostMsg_GetMatchingPlugins,
                             int /* routing_id */,
                             GURL /* url */,
                             GURL /* page_url */,
                             std::string /* mime_type */,
-                            bool /* found */,
-                            webkit::WebPluginInfo /* plugin info */,
-                            std::string /* actual_mime_type */)
+                            std::vector<webkit::WebPluginInfo> /* plugins */,
+                            std::vector<std::string> /* mime_types */,
+                            std::vector<bool> /* allowed */)
 
 // A renderer sends this to the browser process when it wants to
 // create a plugin.  The browser will create the plugin process if
 // necessary, and will return a handle to the channel on success.
 // On error an empty string is returned.
 IPC_SYNC_MESSAGE_CONTROL4_2(ViewHostMsg_OpenChannelToPlugin,
                             int /* routing_id */,
                             GURL /* url */,
                             GURL /* page_url */,
                             std::string /* mime_type */,
@@ skipping 451 matching lines @@
 
 // Requests to lock the mouse. Will result in a ViewMsg_LockMouse_ACK message
 // being sent back.
 IPC_MESSAGE_ROUTED0(ViewHostMsg_LockMouse)
 
 // Requests to unlock the mouse. A ViewMsg_MouseLockLost message will be sent
 // whenever the mouse is unlocked (which may or may not be caused by
 // ViewHostMsg_UnlockMouse).
 IPC_MESSAGE_ROUTED0(ViewHostMsg_UnlockMouse)