Resume a backgrounded renderer that was purged and suspended

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 d9d08837604403d2782db63eee0e53d20a7a2c5d..8c9593204b3c492bd199b6af3eabbf4b5029457a 100644
--- a/content/browser/renderer_host/render_process_host_impl.cc
+++ b/content/browser/renderer_host/render_process_host_impl.cc
@@ -925,6 +925,8 @@ bool RenderProcessHostImpl::Init() {
 
   is_initialized_ = true;
   init_time_ = base::TimeTicks::Now();
+  last_purged_and_suspended_time_ = base::TimeTicks::FromInternalValue(0);
+  last_resumed_in_background_time_ = last_purged_and_suspended_time_;
   return true;
 }
 
@@ -1411,6 +1413,22 @@ bool RenderProcessHostImpl::IsWorkerRefCountDisabled() {
 
 void RenderProcessHostImpl::PurgeAndSuspend() {
   Send(new ChildProcessMsg_PurgeAndSuspend());
+  last_purged_and_suspended_time_ = base::TimeTicks::Now();
+}
+
+void RenderProcessHostImpl::Resume() {
+  Send(new ChildProcessMsg_Resume());
+  last_resumed_in_background_time_ = base::TimeTicks::Now();
+}
+
+const base::TimeTicks& RenderProcessHostImpl::GetLastPurgedAndSuspendedTime()
+    const {
+  return last_purged_and_suspended_time_;
+}
+
+const base::TimeTicks& RenderProcessHostImpl::GetLastResumedInBackgroundTime()
+    const {
+  return last_resumed_in_background_time_;
 }
 
 mojom::Renderer* RenderProcessHostImpl::GetRendererInterface() {