Add support for deleting history.

chrome/android/java/src/org/chromium/chrome/browser/historyreport/AppIndexingReporter.java

Index: chrome/android/java/src/org/chromium/chrome/browser/historyreport/AppIndexingReporter.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/historyreport/AppIndexingReporter.java b/chrome/android/java/src/org/chromium/chrome/browser/historyreport/AppIndexingReporter.java
index d6add855b6e604772fbea6e51b0c28a3e756a800..3286a386f98578a894825f138012df1f2fc8daca 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/historyreport/AppIndexingReporter.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/historyreport/AppIndexingReporter.java
@@ -28,4 +28,13 @@ public class AppIndexingReporter {
     public void reportEntityJsonLd(String url, String json) {
         // Overriden by private class. Base class does nothing.
     }
+
+    /**
+     * Clears history of reported entities.
+     * Currently, we do not support clearing only a subset of history. Base class does not implement
+     * any reporting, and call is a no-op. Child classes should implement this functionality.
+     */
+    public void clearHistory() {
+        // Overriden by private class. Base class does nothing.
+    }
 }