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

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 0f8372ca68ff94845b079a6856a6f912b533bcb8..126df71c74b3b788f1836af075d0ad7733688228 100644
--- a/content/browser/renderer_host/render_process_host_impl.cc
+++ b/content/browser/renderer_host/render_process_host_impl.cc
@@ -791,6 +791,32 @@
   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());
+    if (host->worker_ref_count() != 0) {
+      std::string message = base::StringPrintf(
+          "%zu service workers, %zu shared workers",
+          host->service_worker_ref_count_, host->shared_worker_ref_count_);
+      // Use separate CHECKs for better crash report readability.
+      CHECK(host->service_worker_ref_count_ == 0 ||
+            host->shared_worker_ref_count_ == 0)
+          << message;
+      CHECK_EQ(0UL, host->service_worker_ref_count_) << message;
+      CHECK_EQ(0UL, host->shared_worker_ref_count_) << message;
+    }
+
+    iter.Advance();
+  }
+}
+
 RenderProcessHostImpl::~RenderProcessHostImpl() {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 #ifndef NDEBUG