Last_n: Do not save a snapshot of a closing tab.

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>
 #include <vector>
 
 #include "base/android/callback_android.h"
 #include "base/android/jni_android.h"
 #include "base/android/jni_array.h"
 #include "base/android/jni_string.h"
 #include "base/bind.h"
 #include "base/logging.h"
 #include "chrome/browser/android/offline_pages/offline_page_mhtml_archiver.h"
 #include "chrome/browser/android/offline_pages/offline_page_model_factory.h"
 #include "chrome/browser/android/offline_pages/offline_page_utils.h"
+#include "chrome/browser/android/offline_pages/recent_tab_helper.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"
@@ skipping 544 matching lines @@
   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::WillCloseTab(
+    JNIEnv* env,
+    const JavaParamRef<jobject>& obj,
+    const JavaParamRef<jobject>& j_web_contents) {
+  DCHECK(j_web_contents);
+  content::WebContents* web_contents =
+      content::WebContents::FromJavaWebContents(j_web_contents);
+  DCHECK(web_contents);
+  if (!web_contents)
+    return;
+
+  RecentTabHelper* tab_helper = RecentTabHelper::FromWebContents(web_contents);
+  if (tab_helper)
+    tab_helper->WillCloseTab();
+}
+
 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));
@@ skipping 15 matching lines @@
       env, ConvertUTF8ToJavaString(env, client_id.name_space),
       ConvertUTF8ToJavaString(env, client_id.id));
 }
 
 bool RegisterOfflinePageBridge(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 }  // namespace android
 }  // namespace offline_pages