Add app indexing reporter public class.

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

Index: chrome/android/java/src/org/chromium/chrome/browser/ChromeApplication.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/ChromeApplication.java b/chrome/android/java/src/org/chromium/chrome/browser/ChromeApplication.java
index 17120e871caffbdcfa4cbda7b11184ede7e02aff..0ec4be7aed1bdea5d8f429a30ea7f285be2e7462 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/ChromeApplication.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/ChromeApplication.java
@@ -33,6 +33,7 @@ import org.chromium.chrome.browser.feedback.EmptyFeedbackReporter;
 import org.chromium.chrome.browser.feedback.FeedbackReporter;
 import org.chromium.chrome.browser.gsa.GSAHelper;
 import org.chromium.chrome.browser.help.HelpAndFeedback;
+import org.chromium.chrome.browser.historyreport.AppIndexingReporter;
 import org.chromium.chrome.browser.init.InvalidStartupDialog;
 import org.chromium.chrome.browser.instantapps.InstantAppsHandler;
 import org.chromium.chrome.browser.locale.LocaleManager;
@@ -428,4 +429,12 @@ public class ChromeApplication extends ContentApplication {
     public AccountManagerDelegate createAccountManagerDelegate() {
         return new SystemAccountManagerDelegate(this);
     }
+
+    /**
+     * Creates a new {@link AppIndexingReporter}.
+     * @return the created {@link AppIndexingReporter}.
+     */
+    public AppIndexingReporter createAppIndexingReporter() {
+        return new AppIndexingReporter();
+    }
 }