Experimental 'purging and suspending' backgrounded tabs behind the flag

content/public/test/mock_render_process_host.cc

Index: content/public/test/mock_render_process_host.cc
diff --git a/content/public/test/mock_render_process_host.cc b/content/public/test/mock_render_process_host.cc
index 71d9b7443284e92df8d2b910dbaa1467b5322def..43b47a342ffb39f632e07b907dad43de30a182f3 100644
--- a/content/public/test/mock_render_process_host.cc
+++ b/content/public/test/mock_render_process_host.cc
@@ -298,6 +298,8 @@ void MockRenderProcessHost::DecrementWorkerRefCount() {
   --worker_ref_count_;
 }
 
+void MockRenderProcessHost::PurgeAndSuspend() {}
+
 void MockRenderProcessHost::FilterURL(bool empty_allowed, GURL* url) {
   RenderProcessHostImpl::FilterURL(this, empty_allowed, url);
 }