[Offline Pages] Add an observer for requests in the CCT namespace.

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

Index: chrome/android/java/src/org/chromium/chrome/browser/AppHooks.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/AppHooks.java b/chrome/android/java/src/org/chromium/chrome/browser/AppHooks.java
index b14babebe28fb411fe6b852d1a626e3dfe350e6d..b17d2a3215ce5605bb1c5848cf11d78ee3f95f40 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/AppHooks.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/AppHooks.java
@@ -9,6 +9,7 @@ import android.content.Intent;
 import android.os.Handler;
 import android.os.Looper;
 
+import org.chromium.base.Callback;
 import org.chromium.base.ContextUtils;
 import org.chromium.base.VisibleForTesting;
 import org.chromium.base.annotations.CalledByNative;
@@ -28,6 +29,7 @@ import org.chromium.chrome.browser.media.VideoPersister;
 import org.chromium.chrome.browser.metrics.VariationsSession;
 import org.chromium.chrome.browser.multiwindow.MultiWindowUtils;
 import org.chromium.chrome.browser.net.qualityprovider.ExternalEstimateProviderAndroid;
+import org.chromium.chrome.browser.offlinepages.CCTRequestStatus;
 import org.chromium.chrome.browser.omaha.RequestGenerator;
 import org.chromium.chrome.browser.physicalweb.PhysicalWebBleClient;
 import org.chromium.chrome.browser.policy.PolicyAuditor;
@@ -291,4 +293,13 @@ public abstract class AppHooks {
     public boolean shouldDetectVideoFullscreen() {
         return false;
     }
+
+    /**
+     * @return A callback that will be run each time an offline page is saved in the custom tabs
+     * namespace.
+     */
+    @CalledByNative
+    public Callback<CCTRequestStatus> getOfflinePagesCCTRequestDoneCallback() {
+        return null;
+    }
 }