Schedule idle handler in the foreground tab based on CPU usage and user activity.

content/public/renderer/render_thread.h

Index: content/public/renderer/render_thread.h
diff --git a/content/public/renderer/render_thread.h b/content/public/renderer/render_thread.h
index 2140e70eab82063c732d36c4bb3a08d4e55b834f..ef4caafc4f7d21a995e61f6a5569e916425d2f0c 100644
--- a/content/public/renderer/render_thread.h
+++ b/content/public/renderer/render_thread.h
@@ -96,6 +96,11 @@ class CONTENT_EXPORT RenderThread : public IPC::Message::Sender {
   virtual void SetIdleNotificationDelayInMs(
       int64 idle_notification_delay_in_ms) = 0;
 
+  // Causes the idle handler to skip sending idle notifications
+  // on the two next scheduled calls, so idle notifications are
+  // not sent for at least one notification delay.
+  virtual void PostponeIdleNotification() = 0;

[jam, 2011/11/23 17:35:19]

we only add stuff to the public API that's needed by embedders (i.e. chrome). in
this case this function is only used by content. so can you just add this to
RenderThreadImpl? the code that calls this can use RenderThreadImpl::current()
to get to it (should probably null check since it'll be null in tests).

[ulan, 2011/11/23 18:39:15]

Done.

+
 #if defined(OS_WIN)
   // Request that the given font be loaded by the browser so it's cached by the
   // OS. Please see ChildProcessHost::PreCacheFont for details.