Kill worker process by way of a sync IPC message before it cleans up.

content/browser/worker_host/worker_process_host.cc

 // Copyright (c) 2012 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 "content/browser/worker_host/worker_process_host.h"
 
 #include <set>
 #include <string>
 #include <vector>
 
@@ skipping 300 matching lines @@
 
 bool WorkerProcessHost::OnMessageReceived(const IPC::Message& message) {
   bool msg_is_ok = true;
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP_EX(WorkerProcessHost, message, msg_is_ok)
     IPC_MESSAGE_HANDLER(WorkerHostMsg_WorkerContextClosed,
                         OnWorkerContextClosed)
     IPC_MESSAGE_HANDLER(WorkerProcessHostMsg_AllowDatabase, OnAllowDatabase)
     IPC_MESSAGE_HANDLER(WorkerProcessHostMsg_AllowFileSystem, OnAllowFileSystem)
     IPC_MESSAGE_HANDLER(WorkerProcessHostMsg_AllowIndexedDB, OnAllowIndexedDB)
+    IPC_MESSAGE_HANDLER(WorkerProcessHostMsg_ForceKillWorker,
+                        OnForceKillWorkerProcess)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP_EX()
 
   if (!msg_is_ok) {
     NOTREACHED();
     RecordAction(UserMetricsAction("BadMessageTerminate_WPH"));
     base::KillProcess(
         process_->GetData().handle, RESULT_CODE_KILLED_BAD_MESSAGE, false);
   }
 
@@ skipping 50 matching lines @@
 }
 
 void WorkerProcessHost::OnAllowIndexedDB(int worker_route_id,
                                          const GURL& url,
                                          const string16& name,
                                          bool* result) {
   *result = GetContentClient()->browser()->AllowWorkerIndexedDB(
       url, name, resource_context_, GetRenderViewIDsForWorker(worker_route_id));
 }
 
+void WorkerProcessHost::OnForceKillWorkerProcess() {
+  base::KillProcess(

[michaeln, 2013/09/17 20:30:37]

Is this the same low level api we use elsewhere to kill child processes (like
from the taskmanager or that fast renderer exit code path)... just checking

+        process_->GetData().handle, RESULT_CODE_NORMAL_EXIT, false);

[Cris Neckar, 2013/11/01 23:26:34]

nit: may want to check process_launched_ == true before this. Not sure if this
can happen before the process launched or what you will get back as the handle
if it does.

[meacer, 2013/11/04 18:38:10]

Done.

+}
+
 void WorkerProcessHost::RelayMessage(
     const IPC::Message& message,
     WorkerMessageFilter* filter,
     int route_id) {
   if (message.type() == WorkerMsg_PostMessage::ID) {
     // We want to send the receiver a routing id for the new channel, so
     // crack the message first.
     string16 msg;
     std::vector<int> sent_message_port_ids;
     std::vector<int> new_routing_ids;
@@ skipping 310 matching lines @@
   return false;
 }
 
 WorkerProcessHost::WorkerInstance::FilterInfo
 WorkerProcessHost::WorkerInstance::GetFilter() const {
   DCHECK(NumFilters() == 1);
   return *filters_.begin();
 }
 
 }  // namespace content