Revert r21117 as it caused reliability failures....

chrome/common/child_thread.cc

Index: chrome/common/child_thread.cc
===================================================================
--- chrome/common/child_thread.cc	(revision 21215)
+++ chrome/common/child_thread.cc	(working copy)
@@ -9,66 +9,39 @@
 #include "chrome/common/child_process.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/ipc_logging.h"
-#include "chrome/common/notification_service.h"
 #include "chrome/common/plugin_messages.h"
 #include "webkit/glue/webkit_glue.h"
 
 
-ChildThread::ChildThread() {
+// V8 needs a 1MB stack size.
+const size_t ChildThread::kV8StackSize = 1024 * 1024;
+
+ChildThread::ChildThread(Thread::Options options)
+    : Thread("Chrome_ChildThread"),
+      owner_loop_(MessageLoop::current()),
+      options_(options),
+      check_with_browser_before_shutdown_(false) {
+  DCHECK(owner_loop_);
   channel_name_ = WideToASCII(
       CommandLine::ForCurrentProcess()->GetSwitchValue(
           switches::kProcessChannelID));
-  Init();
-}
 
-ChildThread::ChildThread(const std::string channel_name)
-    : channel_name_(channel_name) {
-  Init();
-}
-
-void ChildThread::Init() {
-  check_with_browser_before_shutdown_ = false;
-  message_loop_ = MessageLoop::current();
   if (CommandLine::ForCurrentProcess()->HasSwitch(switches::kUserAgent)) {
     webkit_glue::SetUserAgent(WideToUTF8(
         CommandLine::ForCurrentProcess()->GetSwitchValue(
             switches::kUserAgent)));
   }
-
-  channel_.reset(new IPC::SyncChannel(channel_name_,
-      IPC::Channel::MODE_CLIENT, this, NULL,
-      ChildProcess::current()->io_message_loop(), true,
-      ChildProcess::current()->GetShutDownEvent()));
-#ifdef IPC_MESSAGE_LOG_ENABLED
-  IPC::Logging::current()->SetIPCSender(this);
-#endif
-
-  resource_dispatcher_.reset(new ResourceDispatcher(this));
-
-  // When running in unit tests, there is already a NotificationService object.
-  // Since only one can exist at a time per thread, check first.
-  if (!NotificationService::current())
-    notification_service_.reset(new NotificationService);
 }
 
 ChildThread::~ChildThread() {
-#ifdef IPC_MESSAGE_LOG_ENABLED
-  IPC::Logging::current()->SetIPCSender(NULL);
-#endif
+}
 
-  // The ChannelProxy object caches a pointer to the IPC thread, so need to
-  // reset it as it's not guaranteed to outlive this object.
-  // NOTE: this also has the side-effect of not closing the main IPC channel to
-  // the browser process.  This is needed because this is the signal that the
-  // browser uses to know that this process has died, so we need it to be alive
-  // until this process is shut down, and the OS closes the handle
-  // automatically.  We used to watch the object handle on Windows to do this,
-  // but it wasn't possible to do so on POSIX.
-  channel_->ClearIPCMessageLoop();
+bool ChildThread::Run() {
+  return StartWithOptions(options_);
 }
 
 void ChildThread::OnChannelError() {
-  MessageLoop::current()->Quit();
+  owner_loop_->PostTask(FROM_HERE, new MessageLoop::QuitTask());
 }
 
 bool ChildThread::Send(IPC::Message* msg) {
@@ -103,7 +76,7 @@
   }
 
   if (msg.type() == PluginProcessMsg_Shutdown::ID) {
-    MessageLoop::current()->Quit();
+    owner_loop_->PostTask(FROM_HERE, new MessageLoop::QuitTask());
     return;
   }
 
@@ -115,12 +88,33 @@
 }
 
 ChildThread* ChildThread::current() {
-  return ChildProcess::current()->main_thread();
+  return ChildProcess::current()->child_thread();
 }
 
+void ChildThread::Init() {
+  channel_.reset(new IPC::SyncChannel(channel_name_,
+      IPC::Channel::MODE_CLIENT, this, NULL, owner_loop_, true,
+      ChildProcess::current()->GetShutDownEvent()));
+#ifdef IPC_MESSAGE_LOG_ENABLED
+  IPC::Logging::current()->SetIPCSender(this);
+#endif
+
+  resource_dispatcher_.reset(new ResourceDispatcher(this));
+}
+
+void ChildThread::CleanUp() {
+#ifdef IPC_MESSAGE_LOG_ENABLED
+  IPC::Logging::current()->SetIPCSender(NULL);
+#endif
+  // Need to destruct the SyncChannel to the browser before we go away because
+  // it caches a pointer to this thread.
+  channel_.reset();
+  resource_dispatcher_.reset();
+}
+
 void ChildThread::OnProcessFinalRelease() {
   if (!check_with_browser_before_shutdown_) {
-    MessageLoop::current()->Quit();
+    owner_loop_->PostTask(FROM_HERE, new MessageLoop::QuitTask());
     return;
   }