Resume a backgrounded renderer that was purged and suspended

content/renderer/render_thread_impl.cc

Index: content/renderer/render_thread_impl.cc
diff --git a/content/renderer/render_thread_impl.cc b/content/renderer/render_thread_impl.cc
index d1545473645b206b6758af47ee6a20a28bd2df17..bee2e9b54bf28cfeeb4eae80770499f01f2ae422 100644
--- a/content/renderer/render_thread_impl.cc
+++ b/content/renderer/render_thread_impl.cc
@@ -1774,6 +1774,15 @@ void RenderThreadImpl::OnProcessPurgeAndSuspend() {
   renderer_scheduler_->SuspendRenderer();
 }
 
+void RenderThreadImpl::OnProcessResume() {
+  ChildThreadImpl::OnProcessResume();
+  if (!is_renderer_suspended_)
+    return;
+
+  is_renderer_suspended_ = false;
+  renderer_scheduler_->ResumeRenderer();
+}
+
 scoped_refptr<gpu::GpuChannelHost> RenderThreadImpl::EstablishGpuChannelSync() {
   TRACE_EVENT0("gpu", "RenderThreadImpl::EstablishGpuChannelSync");