WIP shutdown handler for better stats dumping

content/renderer/render_thread_impl.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/renderer/render_thread_impl.h"
 
 #include <algorithm>
 #include <limits>
 #include <map>
 #include <utility>
@@ skipping 890 matching lines @@
 
 RenderThreadImpl::~RenderThreadImpl() {
 }
 
 void RenderThreadImpl::Shutdown() {
   // In a multi-process mode, we immediately exit the renderer.
   // Historically we had a graceful shutdown sequence here but it was
   // 1) a waste of performance and 2) a source of lots of complicated
   // crashes caused by shutdown ordering. Immediate exit eliminates
   // those problems.
-  //
+
+  // Give the V8 isolate a chance to dump internal stats useful for performance
+  // evaluation and debugging.
+  blink::mainThreadIsolate()->DumpAndResetStats();
+
   // In a single-process mode, we cannot call _exit(0) in Shutdown() because
   // it will exit the process before the browser side is ready to exit.
   if (!base::CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kSingleProcess))
     base::Process::TerminateCurrentProcessImmediately(0);
 }
 
 bool RenderThreadImpl::ShouldBeDestroyed() {
   DCHECK(base::CommandLine::ForCurrentProcess()->HasSwitch(
       switches::kSingleProcess));
@@ skipping 1458 matching lines @@
   }
 }
 
 void RenderThreadImpl::OnRendererInterfaceRequest(
     mojom::RendererAssociatedRequest request) {
   DCHECK(!renderer_binding_.is_bound());
   renderer_binding_.Bind(std::move(request));
 }
 
 }  // namespace content