Show OOM notification bar in all tabs sharing same render process

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 1830 matching lines @@
                     FilePath /* plugin_path */)
 
 // Notifies when a plugin couldn't be loaded because it's outdated.
 IPC_MESSAGE_ROUTED2(ViewHostMsg_BlockedOutdatedPlugin,
                     string16, /* name */
                     GURL      /* update_url */)
 
 // Displays a JavaScript out-of-memory message in the infobar.
 IPC_MESSAGE_ROUTED0(ViewHostMsg_JSOutOfMemory)
 
+// Notifies when render process exausted all JavaSript heap memory.
+IPC_SYNC_MESSAGE_CONTROL0_0(ViewHostMsg_RenderProcessOutOfJSMemory)

[darin (slow to review), 2011/01/19 16:53:51]

Sync messages sent from renderer to browser should not be handled on the
browser's main thread as that can lead to a dead lock.  the browser main thread
can be blocked on a plugin process, which can be blocked on the renderer, which
is sending the sync IPC.

I think you need to install an IPC::MessageFilter to run on the IO thread that
can intercept this message, reply to it, and then PostTask over to the browser
UI thread if that is where you ultimately need to handle this IPC.

+
 // Displays a box to confirm that the user wants to navigate away from the
 // page. Replies true if yes, false otherwise, the reply string is ignored,
 // but is included so that we can use OnJavaScriptMessageBoxClosed.
 IPC_SYNC_MESSAGE_ROUTED2_2(ViewHostMsg_RunBeforeUnloadConfirm,
                            GURL,        /* in - originating frame URL */
                            std::wstring /* in - alert message */,
                            bool         /* out - success */,
                            std::wstring /* out - This is ignored.*/)
 
 IPC_MESSAGE_ROUTED3(ViewHostMsg_SendCurrentPageAllSavableResourceLinks,
@@ skipping 769 matching lines @@
                      int /* request_id */,
                      PP_Flash_NetAddress /* addr */)
 
 // 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 */)