Trigger the Snippets Scheduler when Resuming Activities

components/ntp_snippets/remote/remote_suggestions_scheduler.h

Index: components/ntp_snippets/remote/remote_suggestions_scheduler.h
diff --git a/components/ntp_snippets/remote/remote_suggestions_scheduler.h b/components/ntp_snippets/remote/remote_suggestions_scheduler.h
index 953592ae461dce70fdfd2e9a78a89e0511ece865..cb5d002c5c467e60326de80287ad0122618315d5 100644
--- a/components/ntp_snippets/remote/remote_suggestions_scheduler.h
+++ b/components/ntp_snippets/remote/remote_suggestions_scheduler.h
@@ -13,7 +13,13 @@ namespace ntp_snippets {
 class RemoteSuggestionsScheduler {
  public:
   // External triggers to consider fetching content suggestions.
-  virtual void OnBrowserStartup() = 0;
+  // Called whenever chrome is started warm or the user switches to Chrome.
+  virtual void OnBrowserForegrounded() = 0;
+  // Called whenever chrome is cold started.
+  // To keep start ups fast, defer any work possible.
+  virtual void OnBrowserColdStart() = 0;
+  // Called whenever a new NTP is opened. This may be called on cold starts.
+  // So to keep start ups fast, defer heavy work for cold starts.
   virtual void OnNTPOpened() = 0;
 
   // Fetch content suggestions.