Show OOM notification bar in all tabs sharing same render process

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 aa9172e0856b1dc72bdd65ed39656cdaecba9240..f96beaf700d5b602d4cac8a05ebe080f6fee25c3 100644
--- a/chrome/common/render_messages_internal.h
+++ b/chrome/common/render_messages_internal.h
@@ -1848,6 +1848,9 @@ IPC_MESSAGE_ROUTED2(ViewHostMsg_BlockedOutdatedPlugin,
 // 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.