Bug fix: Use the last hidden time for purge + suspend

content/browser/web_contents/web_contents_impl.cc

Index: content/browser/web_contents/web_contents_impl.cc
diff --git a/content/browser/web_contents/web_contents_impl.cc b/content/browser/web_contents/web_contents_impl.cc
index 8fafdaeb59cce21eb0bde46d2e6f87fbeb6b1e2d..fb769b94f04f73939108eb5a177b3b31765b8442 100644
--- a/content/browser/web_contents/web_contents_impl.cc
+++ b/content/browser/web_contents/web_contents_impl.cc
@@ -1324,6 +1324,10 @@ void WebContentsImpl::SetLastActiveTime(base::TimeTicks last_active_time) {
   last_active_time_ = last_active_time;
 }
 
+base::TimeTicks WebContentsImpl::GetLastHiddenTime() const {
+  return last_hidden_time_;
+}
+
 void WebContentsImpl::WasShown() {
   controller_.SetActive(true);
 
@@ -1364,6 +1368,8 @@ void WebContentsImpl::WasHidden() {
     SendPageMessage(new PageMsg_WasHidden(MSG_ROUTING_NONE));
   }
 
+  last_hidden_time_ = base::TimeTicks::Now();
+
   for (auto& observer : observers_)
     observer.WasHidden();