Reland of Check that all shared workers are terminated. (patchset #2 id:170001 of https://c…

content/browser/browser_main_loop.cc

Index: content/browser/browser_main_loop.cc
diff --git a/content/browser/browser_main_loop.cc b/content/browser/browser_main_loop.cc
index 800159fd704b17b48aca7405da9ab101ec055a7f..487e421bc7c742c433540ca09d657a47fd48723f 100644
--- a/content/browser/browser_main_loop.cc
+++ b/content/browser/browser_main_loop.cc
@@ -1096,6 +1096,12 @@
       case BrowserThread::IO: {
         TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:IOThread");
         ResetThread_IO(std::move(io_thread_));
+
+        // TODO(alokp): Remove after collecting crash data.
+        // Temporary checks to verify that all shared workers are terminated.
+        // It is suspected that shared workers prevent render process hosts
+        // from shutting down: crbug.com/608049
+        RenderProcessHostImpl::CheckAllWorkersTerminated();
         break;
       }
       case BrowserThread::UI: