This adds some plumbing for propagating the reason for a renderer's death

chrome/common/render_messages_internal.h

 // Copyright (c) 2010 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.
 
 // This header is meant to be included in multiple passes, hence no traditional
 // header guard.
 // See ipc_message_macros.h for explanation of the macros and passes.
 
 #include <map>
 #include <string>
@@ skipping 1175 matching lines @@
 
   IPC_MESSAGE_CONTROL1(ViewHostMsg_UpdatedCacheStats,
                        WebKit::WebCache::UsageStats /* stats */)
 
   // Indicates the renderer is ready in response to a ViewMsg_New or
   // a ViewMsg_CreatingNew_ACK.
   IPC_MESSAGE_ROUTED0(ViewHostMsg_RenderViewReady)
 
   // Indicates the renderer process is gone.  This actually is sent by the
   // browser process to itself, but keeps the interface cleaner.
-  IPC_MESSAGE_ROUTED0(ViewHostMsg_RenderViewGone)
+  IPC_MESSAGE_ROUTED2(ViewHostMsg_RenderViewGone,
+                      int, /* this really is base::TerminationStatus */
+                      int /* exit_code */)
 
   // Sent by the renderer process to request that the browser close the view.
   // This corresponds to the window.close() API, and the browser may ignore
   // this message.  Otherwise, the browser will generates a ViewMsg_Close
   // message to close the view.
   IPC_MESSAGE_ROUTED0(ViewHostMsg_Close)
 
   // Sent by the renderer process to request that the browser move the view.
   // This corresponds to the window.resizeTo() and window.moveTo() APIs, and
   // the browser may ignore this message.
@@ skipping 1863 matching lines @@
                               base::PlatformFileInfo, /* info */
                               base::PlatformFileError /* error_code */)
 
   // Get the directory's contents.
   IPC_SYNC_MESSAGE_CONTROL1_2(ViewHostMsg_PepperGetDirContents,
                               FilePath /* path */,
                               PepperDirContents, /* contents */
                               base::PlatformFileError /* error_code */)
 
 IPC_END_MESSAGES(ViewHost)