Only show Last N Pages in the UI when the corresponding tab is visible.

chrome/browser/android/offline_pages/offline_page_bridge.cc

 // 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.
 
 #include "chrome/browser/android/offline_pages/offline_page_bridge.h"
 
 #include <memory>
 #include <set>
 #include <string>
 #include <utility>
@@ skipping 10 matching lines @@
 #include "chrome/browser/android/offline_pages/offline_page_utils.h"
 #include "chrome/browser/android/offline_pages/request_coordinator_factory.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_android.h"
 #include "components/offline_pages/core/background/request_coordinator.h"
 #include "components/offline_pages/core/background/request_queue_results.h"
 #include "components/offline_pages/core/background/save_page_request.h"
 #include "components/offline_pages/core/offline_page_feature.h"
 #include "components/offline_pages/core/offline_page_item.h"
 #include "components/offline_pages/core/offline_page_model.h"
+#include "components/offline_pages/core/recent_tabs/recent_tabs_ui_adapter_delegate.h"
 #include "components/offline_pages/core/request_header/offline_page_header.h"
 #include "content/public/browser/browser_context.h"
 #include "content/public/browser/web_contents.h"
 #include "jni/OfflinePageBridge_jni.h"
 #include "jni/SavePageRequest_jni.h"
 #include "net/base/filename_util.h"
 
 using base::android::ConvertJavaStringToUTF8;
 using base::android::ConvertUTF8ToJavaString;
 using base::android::JavaParamRef;
@@ skipping 521 matching lines @@
     // Callback with null to signal that results are unavailable.
     const JavaParamRef<jobject> empty_result(nullptr);
     base::android::RunCallbackAndroid(j_callback_obj, empty_result);
     return;
   }
 
   coordinator->RemoveRequests(
       request_ids, base::Bind(&OnRemoveRequestsDone, j_callback_ref));
 }
 
+void OfflinePageBridge::RegisterRecentTab(JNIEnv* env,
+                                          const JavaParamRef<jobject>& obj,
+                                          int tab_id) {
+  RequestCoordinator* request_coordinator =
+      RequestCoordinatorFactory::GetForBrowserContext(browser_context_);
+
+  RecentTabsUIAdapterDelegate* ui_adapter_delegate =
+      RecentTabsUIAdapterDelegate::FromDownloadUIAdapter(
+          RecentTabsUIAdapterDelegate::GetOrCreateRecentTabsUIAdapter(
+              offline_page_model_, request_coordinator));
+  ui_adapter_delegate->RegisterTab(tab_id);
+}
+
+void OfflinePageBridge::UnregisterRecentTab(JNIEnv* env,
+                                            const JavaParamRef<jobject>& obj,
+                                            int tab_id) {
+  RequestCoordinator* request_coordinator =
+      RequestCoordinatorFactory::GetForBrowserContext(browser_context_);
+
+  RecentTabsUIAdapterDelegate* ui_adapter_delegate =
+      RecentTabsUIAdapterDelegate::FromDownloadUIAdapter(
+          RecentTabsUIAdapterDelegate::GetOrCreateRecentTabsUIAdapter(
+              offline_page_model_, request_coordinator));
+  ui_adapter_delegate->UnregisterTab(tab_id);
+}
+
 void OfflinePageBridge::NotifyIfDoneLoading() const {
   if (!offline_page_model_->is_loaded())
     return;
   JNIEnv* env = base::android::AttachCurrentThread();
   Java_OfflinePageBridge_offlinePageModelLoaded(env, java_ref_);
 }
 
 
 ScopedJavaLocalRef<jobject> OfflinePageBridge::CreateClientId(
     JNIEnv* env,
     const ClientId& client_id) const {
   return Java_OfflinePageBridge_createClientId(
       env, ConvertUTF8ToJavaString(env, client_id.name_space),
       ConvertUTF8ToJavaString(env, client_id.id));
 }
 
 bool RegisterOfflinePageBridge(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 }  // namespace android
 }  // namespace offline_pages