Change the DidChangeView update to take a new ViewChanged resource.

chrome/browser/renderer_host/chrome_render_message_filter.cc

Index: chrome/browser/renderer_host/chrome_render_message_filter.cc
diff --git a/chrome/browser/renderer_host/chrome_render_message_filter.cc b/chrome/browser/renderer_host/chrome_render_message_filter.cc
index 670041360f194a4f22d6d422918d7ea25e5c3428..88076b3fd67a332f560946b953d68a060d970917 100644
--- a/chrome/browser/renderer_host/chrome_render_message_filter.cc
+++ b/chrome/browser/renderer_host/chrome_render_message_filter.cc
@@ -147,7 +147,12 @@ void ChromeRenderMessageFilter::OverrideThreadForMessage(
 void ChromeRenderMessageFilter::OnLaunchNaCl(
     const std::wstring& url, int socket_count, IPC::Message* reply_msg) {
   NaClProcessHost* host = new NaClProcessHost(url);
-  host->Launch(this, socket_count, reply_msg);
+  if (!host->Launch(this, socket_count, reply_msg)) {
+    // On failure, the NaClProcessHost didn't send the reply which the renderer
+    // is blocked on. Unblock the renderer by sending an error.
+    reply_msg->set_reply_error();

[dmichael (off chromium), 2011/12/20 19:01:34]

Now that I think about it, did you mean for this stuff to be in another CL?
Seems like it could be independent.

+    Send(reply_msg);
+  }
 }
 #endif