Reland of Check that all shared workers are terminated.

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 64e9f0c7b2f5acdf242fab58d6e00f59d5fed9fc..2beb2b18d3872cac26c28fbfd1f01179010aa1ac 100644
--- a/content/browser/renderer_host/render_process_host_impl.cc
+++ b/content/browser/renderer_host/render_process_host_impl.cc
@@ -708,6 +708,20 @@
   g_renderer_main_thread_factory = create;
 }
 
+// static
+// 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
+void RenderProcessHostImpl::CheckAllWorkersTerminated() {
+  iterator iter(AllHostsIterator());
+  while (!iter.IsAtEnd()) {
+    RenderProcessHostImpl* host =
+        static_cast<RenderProcessHostImpl*>(iter.GetCurrentValue());
+    CHECK_EQ(0, host->worker_ref_count_);
+  }
+}
+
 RenderProcessHostImpl::~RenderProcessHostImpl() {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 #ifndef NDEBUG