Send foreground/backgroudn notifications to V8 independent from RunIdleHandlerWhenWidgetsHidden.

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 9cb97a93dc9ad31f2c4019a1d457c49eb1862eed..b695bc83480813b2c2874a7f055c6deec588ec5f 100644
--- a/content/renderer/render_thread_impl.cc
+++ b/content/renderer/render_thread_impl.cc
@@ -2135,19 +2135,19 @@ void RenderThreadImpl::WidgetRestored() {
 }
 
 void RenderThreadImpl::OnRendererHidden() {
+  blink::mainThreadIsolate()->IsolateInBackgroundNotification();
   // TODO(rmcilroy): Remove IdleHandler and replace it with an IdleTask
   // scheduled by the RendererScheduler - http://crbug.com/469210.
   if (!GetContentClient()->renderer()->RunIdleHandlerWhenWidgetsHidden())
     return;
   ScheduleIdleHandler(kInitialIdleHandlerDelayMs);
-  blink::mainThreadIsolate()->IsolateInBackgroundNotification();
 }
 
 void RenderThreadImpl::OnRendererVisible() {
+  blink::mainThreadIsolate()->IsolateInForegroundNotification();
   if (!GetContentClient()->renderer()->RunIdleHandlerWhenWidgetsHidden())
     return;
   ScheduleIdleHandler(kLongIdleHandlerDelayMs);
-  blink::mainThreadIsolate()->IsolateInForegroundNotification();
 }
 
 void RenderThreadImpl::ReleaseFreeMemory() {