[Offline pages] Detecting missing offline copy

chrome/android/javatests/src/org/chromium/chrome/browser/offlinepages/OfflinePageBridgeTest.java

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package org.chromium.chrome.browser.offlinepages;
 
 import android.test.suitebuilder.annotation.MediumTest;
 
 import org.chromium.base.ThreadUtils;
 import org.chromium.chrome.browser.ChromeActivity;
@@ skipping 39 matching lines @@
                 mOfflinePageBridge = new OfflinePageBridge(profile);
                 if (mOfflinePageBridge.isOfflinePageModelLoaded()) {
                     semaphore.release();
                 } else {
                     mOfflinePageBridge.addObserver(new OfflinePageModelObserver() {
                         @Override
                         public void offlinePageModelLoaded() {
                             semaphore.release();
                             mOfflinePageBridge.removeObserver(this);
                         }
+
+                        @Override
+                        public void offlinePageDeleted(BookmarkId bookmarkId) {}
                     });
                 }
             }
         });
         assertTrue(semaphore.tryAcquire(TIMEOUT_MS, TimeUnit.MILLISECONDS));
     }
 
     @Override
     public void startMainActivity() throws InterruptedException {
         startMainActivityOnBlankPage();
@@ skipping 140 matching lines @@
                     result.add(item);
                 }
 
                 semaphore.release();
             }
         });
         assertTrue(semaphore.tryAcquire(TIMEOUT_MS, TimeUnit.MILLISECONDS));
         return result;
     }
 }