Last_n: disable on Svelte devices.

chrome/browser/android/offline_pages/recent_tab_helper.cc

 // Copyright (c) 2016 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/recent_tab_helper.h"
 
 #include <queue>
 #include <vector>
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/strings/string_number_conversions.h"
+#include "base/sys_info.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "base/time/time.h"
 #include "chrome/browser/android/offline_pages/downloads/offline_page_notification_bridge.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/request_coordinator_factory.h"
 #include "components/offline_pages/core/background/request_coordinator.h"
 #include "components/offline_pages/core/client_namespace_constants.h"
 #include "components/offline_pages/core/offline_page_feature.h"
@@ skipping 54 matching lines @@
 
   // Expected snapshot quality should the saving succeed. This value is only
   // valid for successfully saved snapshots.
   SnapshotController::PageQuality expected_page_quality =
       SnapshotController::PageQuality::POOR;
 };
 
 RecentTabHelper::RecentTabHelper(content::WebContents* web_contents)
     : content::WebContentsObserver(web_contents),
       delegate_(new DefaultDelegate()),
+      is_low_end_device_(base::SysInfo::IsLowEndDevice()),
       weak_ptr_factory_(this) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
 }
 
 RecentTabHelper::~RecentTabHelper() {
 }
 
 void RecentTabHelper::SetDelegate(
     std::unique_ptr<RecentTabHelper::Delegate> delegate) {
   DCHECK(delegate);
@@ skipping 105 matching lines @@
   // Check for conditions that would cause us not to snapshot.
   bool can_save = !navigation_handle->IsErrorPage() &&
                   OfflinePageModel::CanSaveURL(snapshot_url_) &&
                   OfflinePageUtils::GetOfflinePageFromWebContents(
                       web_contents()) == nullptr;
 
   UMA_HISTOGRAM_BOOLEAN("OfflinePages.CanSaveRecentPage", can_save);
 
   if (!can_save)
     snapshot_controller_->Stop();
-  last_n_listen_to_tab_hidden_ = can_save && IsOffliningRecentPagesEnabled();
+  last_n_listen_to_tab_hidden_ =
+      can_save && !is_low_end_device_ && IsOffliningRecentPagesEnabled();
   last_n_latest_saved_quality_ = PageQuality::POOR;
 }
 
 void RecentTabHelper::DocumentAvailableInMainFrame() {
   EnsureInitialized();
   snapshot_controller_->DocumentAvailableInMainFrame();
 }
 
 void RecentTabHelper::DocumentOnLoadCompletedInMainFrame() {
   EnsureInitialized();
@@ skipping 198 matching lines @@
 }
 
 void RecentTabHelper::CancelInFlightSnapshots() {
   weak_ptr_factory_.InvalidateWeakPtrs();
   downloads_ongoing_snapshot_info_.reset();
   downloads_latest_saved_snapshot_info_.reset();
   last_n_ongoing_snapshot_info_.reset();
 }
 
 }  // namespace offline_pages