Enable spare RenderProcessHost to be preinitialized.

content/public/test/mock_render_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/public/test/mock_render_process_host.h"
 
 #include <algorithm>
 #include <utility>
 #include <vector>
 
@@ skipping 349 matching lines @@
 }
 
 bool MockRenderProcessHost::IsUnused() {
   return is_unused_;
 }
 
 void MockRenderProcessHost::SetIsUsed() {
   is_unused_ = false;
 }
 
+bool MockRenderProcessHost::HostHasNotBeenUsed() {
+  return IsUnused() && listeners_.IsEmpty() && GetWorkerRefCount() == 0;
+}
+
 void MockRenderProcessHost::FilterURL(bool empty_allowed, GURL* url) {
   RenderProcessHostImpl::FilterURL(this, empty_allowed, url);
 }
 
 #if BUILDFLAG(ENABLE_WEBRTC)
 void MockRenderProcessHost::EnableAudioDebugRecordings(
     const base::FilePath& file) {
 }
 
 void MockRenderProcessHost::DisableAudioDebugRecordings() {}
@@ skipping 63 matching lines @@
   for (auto it = processes_.begin(); it != processes_.end(); ++it) {
     if (it->get() == host) {
       it->release();
       processes_.erase(it);
       break;
     }
   }
 }
 
 }  // namespace content