Browser Plugin: Update Guest WebContents Visibility on BrowserPlugin Visiblity Change.

content/common/browser_plugin_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.
 
 // Multiply-included message header, no traditional include guard.
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/process.h"
@@ skipping 99 matching lines @@
 IPC_MESSAGE_ROUTED3(BrowserPluginHostMsg_NavigateGuest,
                     int /* instance_id*/,
                     std::string /* src */,
                     BrowserPluginHostMsg_ResizeGuest_Params /* resize_params */)
 
 // When a BrowserPlugin has been removed from the embedder's DOM, it informs
 // the browser process to cleanup the guest.
 IPC_MESSAGE_ROUTED1(BrowserPluginHostMsg_PluginDestroyed,
                     int /* instance_id */)
 
+// Tells the guest it has been shown or hidden.
+IPC_MESSAGE_ROUTED2(BrowserPluginHostMsg_SetVisibility,
+                    int /* instance_id */,
+                    bool /* visible */)
+
 // -----------------------------------------------------------------------------
 // These messages are from the guest renderer to the browser process
 
 // A embedder sends this message to the browser when it wants
 // to resize a guest plugin container so that the guest is relaid out
 // according to the new size.
 IPC_SYNC_MESSAGE_ROUTED2_0(BrowserPluginHostMsg_ResizeGuest,
                            int /* instance_id*/,
                            BrowserPluginHostMsg_ResizeGuest_Params)
 
@@ skipping 83 matching lines @@
 IPC_MESSAGE_CONTROL2(BrowserPluginMsg_ShouldAcceptTouchEvents,
                      int /* instance_id */,
                      bool /* accept */)
 
 // The guest has damage it wants to convey to the embedder so that it can
 // update its backing store.
 IPC_MESSAGE_CONTROL3(BrowserPluginMsg_UpdateRect,
                      int /* instance_id */,
                      int /* message_id */,
                      BrowserPluginMsg_UpdateRect_Params)