Add end-to-end test for CopylessPaste

chrome/android/java/src/org/chromium/chrome/browser/AppIndexingUtil.java

Index: chrome/android/java/src/org/chromium/chrome/browser/AppIndexingUtil.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/AppIndexingUtil.java b/chrome/android/java/src/org/chromium/chrome/browser/AppIndexingUtil.java
index 8b54604ab13c7e9220ca7503d22ecee06abd24b3..f0398fc37324fec487b7c25f2113939fbe54ab3f 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/AppIndexingUtil.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/AppIndexingUtil.java
@@ -8,6 +8,7 @@ import android.os.SystemClock;
 import android.util.LruCache;
 import android.webkit.URLUtil;
 
+import org.chromium.base.Callback;
 import org.chromium.base.SysUtils;
 import org.chromium.base.VisibleForTesting;
 import org.chromium.blink.mojom.document_metadata.CopylessPaste;
@@ -29,6 +30,8 @@ public class AppIndexingUtil {
     // and instead just report the view (not the content) to App Indexing.
     private LruCache<String, CacheEntry> mPageCache;
 
+    private static Callback<WebPage> sCallbackForTesting;
+
     /**
      * Extracts entities from document metadata and reports it to on-device App Indexing.
      * This call can cache entities from recently parsed webpages, in which case, only the url and
@@ -62,6 +65,9 @@ public class AppIndexingUtil {
                 @Override
                 public void call(WebPage webpage) {
                     putCacheEntry(url, webpage != null);
+                    if (sCallbackForTesting != null) {
+                        sCallbackForTesting.onResult(webpage);
+                    }
                     if (webpage == null) return;
                     getAppIndexingReporter().reportWebPage(webpage);
                 }
@@ -69,6 +75,11 @@ public class AppIndexingUtil {
         }
     }
 
+    @VisibleForTesting
+    public static void setCallbackForTesting(Callback<WebPage> callback) {
+        sCallbackForTesting = callback;
+    }
+
     private boolean wasPageVisitedRecently(String url) {
         if (url == null) {
             return false;