Trigger the Snippets Scheduler when Resuming Activities

chrome/android/java/src/org/chromium/chrome/browser/ntp/snippets/SnippetsBridge.java

Index: chrome/android/java/src/org/chromium/chrome/browser/ntp/snippets/SnippetsBridge.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/ntp/snippets/SnippetsBridge.java b/chrome/android/java/src/org/chromium/chrome/browser/ntp/snippets/SnippetsBridge.java
index 4625b133e6d759f246aafcec3dd53b68e7adb4b4..3a98264f4f6ea7a61527048bb9bef5456f59bd7f 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/ntp/snippets/SnippetsBridge.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/ntp/snippets/SnippetsBridge.java
@@ -179,6 +179,16 @@ public class SnippetsBridge implements SuggestionsSource {
         nativeOnNTPInitialized(mNativeSnippetsBridge);
     }
 
+    public static void notifySchedulerAboutWarmResume() {
+        SnippetsBridge snippetsBridge = new SnippetsBridge(Profile.getLastUsedProfile());
+        snippetsBridge.onActivityWarmResumed();
+    }
+
+    public static void notifySchedulerAboutColdStart() {
+        SnippetsBridge snippetsBridge = new SnippetsBridge(Profile.getLastUsedProfile());
+        snippetsBridge.onColdStart();
+    }
+
     public static void onSuggestionTargetVisited(int category, long visitTimeMs) {
         nativeOnSuggestionTargetVisited(category, visitTimeMs);
     }
@@ -208,6 +218,16 @@ public class SnippetsBridge implements SuggestionsSource {
         nativeFetch(mNativeSnippetsBridge, category, displayedSuggestionIds);
     }
 
+    private void onActivityWarmResumed() {
+        assert mNativeSnippetsBridge != 0;
+        nativeOnActivityWarmResumed(mNativeSnippetsBridge);
+    }
+
+    private void onColdStart() {
+        assert mNativeSnippetsBridge != 0;
+        nativeOnColdStart(mNativeSnippetsBridge);
+    }
+
     @CalledByNative
     private static List<SnippetArticle> createSuggestionList() {
         return new ArrayList<>();
@@ -312,6 +332,8 @@ public class SnippetsBridge implements SuggestionsSource {
             long nativeNTPSnippetsBridge, int category, int position);
     private native void nativeOnMoreButtonClicked(
             long nativeNTPSnippetsBridge, int category, int position);
+    private native void nativeOnActivityWarmResumed(long nativeNTPSnippetsBridge);
+    private native void nativeOnColdStart(long nativeNTPSnippetsBridge);
     private static native void nativeOnSuggestionTargetVisited(int category, long visitTimeMs);
     private static native void nativeOnNTPInitialized(long nativeNTPSnippetsBridge);
     private native void nativeSetObserver(long nativeNTPSnippetsBridge, SnippetsBridge bridge);