MemoryCoordinator checks if ServiceWorker exists on the suspending process

content/browser/memory/memory_coordinator.cc

 // Copyright 2016 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/browser/memory/memory_coordinator.h"
 
 #include "base/memory/memory_coordinator_client_registry.h"
 #include "base/metrics/histogram_macros.h"
 #include "content/public/browser/content_browser_client.h"
 #include "content/public/browser/render_process_host.h"
@@ skipping 149 matching lines @@
   children_.erase(render_process_id);
 }
 
 bool MemoryCoordinator::CanSuspendRenderer(int render_process_id) {
   // If there is no delegate (i.e. unittests), renderers are always suspendable.
   if (!delegate_)
     return true;
   auto* render_process_host = RenderProcessHost::FromID(render_process_id);
   if (!render_process_host || !render_process_host->IsProcessBackgrounded())
     return false;
+  if (render_process_host->GetWorkerRefCount() > 0)
+    return false;
   return delegate_->CanSuspendBackgroundedRenderer(render_process_id);
 }
 
 mojom::MemoryState MemoryCoordinator::OverrideGlobalState(
     mojom::MemoryState memory_state,
     const ChildInfo& child) {
   // We don't suspend foreground renderers. Throttle them instead.
   if (child.is_visible && memory_state == mojom::MemoryState::SUSPENDED)
     return mojom::MemoryState::THROTTLED;
 #if defined(OS_ANDROID)
@@ skipping 28 matching lines @@
 
 MemoryCoordinator::ChildInfo::ChildInfo() {}
 
 MemoryCoordinator::ChildInfo::ChildInfo(const ChildInfo& rhs) {
   // This is a nop, but exists for compatibility with STL containers.
 }
 
 MemoryCoordinator::ChildInfo::~ChildInfo() {}
 
 }  // namespace content