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

chrome/browser/task_manager/task_manager.cc

 // 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.
 
 #include "chrome/browser/task_manager/task_manager.h"
 
 #include "app/l10n_util.h"
 #include "app/resource_bundle.h"
 #include "base/compiler_specific.h"
 #include "base/i18n/number_formatting.h"
@@ skipping 926 matching lines @@
   // killing a process that manages several pages.
   return index < model_->ResourceCount() &&
       model_->GetResourceProcessHandle(index) ==
       base::GetCurrentProcessHandle();
 }
 
 void TaskManager::KillProcess(int index) {
   base::ProcessHandle process = model_->GetResourceProcessHandle(index);
   DCHECK(process);
   if (process != base::GetCurrentProcessHandle())
-    base::KillProcess(process, base::PROCESS_END_KILLED_BY_USER, false);
+    base::KillProcess(process, base::EXIT_CODE_PROCESS_WAS_KILLED, false);
 }
 
 void TaskManager::ActivateProcess(int index) {
   // GetResourceTabContents returns a pointer to the relevant tab contents for
   // the resource.  If the index doesn't correspond to a Tab (i.e. refers to
   // the Browser process or a plugin), GetTabContents will return NULL.
   TabContents* chosen_tab_contents = model_->GetResourceTabContents(index);
   if (chosen_tab_contents)
     chosen_tab_contents->Activate();
 }
@@ skipping 66 matching lines @@
   MetricsMap::const_iterator iter = metrics_map_.find(handle);
   if (iter == metrics_map_.end())
     return false;
 
   if (!iter->second->GetMemoryBytes(&usage->first, &usage->second))
     return false;
 
   memory_usage_map_.insert(std::make_pair(handle, *usage));
   return true;
 }