Add IncrementWorkerRefCount() and DecrementWorkerRefCount() to RenderProcessHostImpl.

content/browser/renderer_host/render_process_host_impl.cc

Index: content/browser/renderer_host/render_process_host_impl.cc
diff --git a/content/browser/renderer_host/render_process_host_impl.cc b/content/browser/renderer_host/render_process_host_impl.cc
index bb18da330e9f8255b66d1150639c68523fd27317..a12f1a42082238b30b66ea854e596f2f19f5c910 100644
--- a/content/browser/renderer_host/render_process_host_impl.cc
+++ b/content/browser/renderer_host/render_process_host_impl.cc
@@ -398,7 +398,8 @@ RenderProcessHostImpl::RenderProcessHostImpl(
           power_monitor_broadcaster_(this),
           geolocation_dispatcher_host_(NULL),
           weak_factory_(this),
-          screen_orientation_dispatcher_host_(NULL) {
+          screen_orientation_dispatcher_host_(NULL),
+          has_external_worker_client_(false) {
   widget_helper_ = new RenderWidgetHelper();
 
   ChildProcessSecurityPolicyImpl::GetInstance()->Add(GetID());
@@ -1227,6 +1228,9 @@ bool RenderProcessHostImpl::FastShutdownIfPossible() {
   if (!SuddenTerminationAllowed())
     return false;
 
+  if (has_external_worker_client_)
+    return false;
+
   // Set this before ProcessDied() so observers can tell if the render process
   // died due to fast shutdown versus another cause.
   fast_shutdown_started_ = true;
@@ -1452,7 +1456,7 @@ void RenderProcessHostImpl::Cleanup() {
   delayed_cleanup_needed_ = false;
 
   // When there are no other owners of this object, we can delete ourselves.
-  if (listeners_.IsEmpty()) {
+  if (listeners_.IsEmpty() && !has_external_worker_client_) {
     // We cannot clean up twice; if this fails, there is an issue with our
     // control flow.
     DCHECK(!deleting_soon_);
@@ -2083,4 +2087,12 @@ void RenderProcessHostImpl::SendDisableAecDumpToRenderer() {
 }
 #endif
 
+void RenderProcessHostImpl::SetExternalClientStatus(
+  bool has_external_worker_client) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  has_external_worker_client_ = has_external_worker_client;
+  if (!has_external_worker_client)
+    Cleanup();
+}
+
 }  // namespace content