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// 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/sessions/session_restore_delegate.h"
#include "base/metrics/field_trial.h"
#include "chrome/browser/sessions/session_restore_stats_collector.h"
#include "chrome/browser/sessions/tab_loader.h"
#include "chrome/common/url_constants.h"
#include "components/favicon/content/content_favicon_driver.h"
#include "content/public/browser/web_contents.h"
namespace {
bool IsInternalPage(const GURL& url) {
// There are many chrome:// UI URLs, but only look for the ones that users
// are likely to have open. Most of the benefit is from the NTP URL.
const char* const kReloadableUrlPrefixes[] = {
chrome::kChromeUIDownloadsURL,
chrome::kChromeUIHistoryURL,
chrome::kChromeUINewTabURL,
chrome::kChromeUISettingsURL,
};
// Prefix-match against the table above. Use strncmp to avoid allocating
// memory to convert the URL prefix constants into std::strings.
for (size_t i = 0; i < arraysize(kReloadableUrlPrefixes); ++i) {
if (!strncmp(url.spec().c_str(), kReloadableUrlPrefixes[i],
strlen(kReloadableUrlPrefixes[i])))
return true;
}
return false;
}
} // namespace
SessionRestoreDelegate::RestoredTab::RestoredTab(content::WebContents* contents,
bool is_active,
bool is_app,
bool is_pinned)
: contents_(contents),
is_active_(is_active),
is_app_(is_app),
is_internal_page_(IsInternalPage(contents->GetLastCommittedURL())),
is_pinned_(is_pinned) {
}
bool SessionRestoreDelegate::RestoredTab::operator<(
const RestoredTab& right) const {
// Tab with internal web UI like NTP or Settings are good choices to
// defer loading.
if (is_internal_page_ != right.is_internal_page_)
return !is_internal_page_;
// Pinned tabs should be loaded first.
if (is_pinned_ != right.is_pinned_)
return is_pinned_;
// Apps should be loaded before normal tabs.
if (is_app_ != right.is_app_)
return is_app_;
// Restore using MRU. Behind an experiment for now.
if (SessionRestore::GetSmartRestoreMode() ==
SessionRestore::SMART_RESTORE_MODE_MRU)
return contents_->GetLastActiveTime() >
right.contents_->GetLastActiveTime();
return false;
}
// static
void SessionRestoreDelegate::RestoreTabs(
const std::vector<RestoredTab>& tabs,
const base::TimeTicks& restore_started) {
// Restore the favicon for all tabs. Any tab may end up being deferred due
// to memory pressure so it's best to have some visual indication of its
// contents.
for (const auto& restored_tab : tabs) {
// Restore the favicon for deferred tabs.
favicon::ContentFaviconDriver* favicon_driver =
favicon::ContentFaviconDriver::FromWebContents(restored_tab.contents());
favicon_driver->FetchFavicon(favicon_driver->GetActiveURL());
}
// This experiment allows us to have comparative numbers for session restore
// metrics. It will be removed once those numbers are obtained.
// TODO(georgesak): Remove this experiment when stats are collected.
base::FieldTrial* trial =
base::FieldTrialList::Find("IntelligentSessionRestore");
if (!trial || trial->group_name() != "DontRestoreBackgroundTabs") {
TabLoader::RestoreTabs(tabs, restore_started);
} else {
// A TabLoader will not be used for this session restore, so manually create
// and use a SessionRestoreStatsCollector, normally owned by the TabLoader.
scoped_ptr<SessionRestoreStatsCollector::StatsReportingDelegate>
reporting_delegate(
new SessionRestoreStatsCollector::UmaStatsReportingDelegate());
scoped_refptr<SessionRestoreStatsCollector> stats_collector =
new SessionRestoreStatsCollector(restore_started,
reporting_delegate.Pass());
stats_collector->TrackTabs(tabs);
for (const auto& restored_tab : tabs) {
if (!restored_tab.is_active()) {
// Non-active tabs aren't being loaded, so mark them as deferred.
auto tab_controller = &restored_tab.contents()->GetController();
stats_collector->DeferTab(tab_controller);
}
}
}
}
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