Resume a backgrounded renderer that was purged and suspended

content/browser/renderer_host/render_process_host_impl.h

Index: content/browser/renderer_host/render_process_host_impl.h
diff --git a/content/browser/renderer_host/render_process_host_impl.h b/content/browser/renderer_host/render_process_host_impl.h
index 419e0cd3df4b0b4ffcb39760bd194835307c4885..bbefe08c7e82564c1b4e4f72e32d31a247bb3b69 100644
--- a/content/browser/renderer_host/render_process_host_impl.h
+++ b/content/browser/renderer_host/render_process_host_impl.h
@@ -175,6 +175,9 @@ class CONTENT_EXPORT RenderProcessHostImpl
   void ForceReleaseWorkerRefCounts() override;
   bool IsWorkerRefCountDisabled() override;
   void PurgeAndSuspend() override;
+  void Resume() override;
+  const base::TimeTicks& GetLastPurgedAndSuspendedTime() const override;
+  const base::TimeTicks& GetLastResumedInBackgroundTime() const override;
 
   mojom::RouteProvider* GetRemoteRouteProvider();
 
@@ -465,6 +468,12 @@ class CONTENT_EXPORT RenderProcessHostImpl
   // Stores the time at which the first call to Init happened.
   base::TimeTicks init_time_;
 
+  // The last time when the renderer is purged and suspended.
+  base::TimeTicks last_purged_and_suspended_time_;
+
+  // The last time when the renderer is resumed in the background.
+  base::TimeTicks last_resumed_in_background_time_;
+
   // Used to launch and terminate the process without blocking the UI thread.
   std::unique_ptr<ChildProcessLauncher> child_process_launcher_;