Hotlist Slow: Adopt ChromeOS Session restore tab loading timeouts.

chrome/browser/sessions/tab_loader_delegate_chromeos.cc

-// Copyright 2014 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/tab_loader_delegate.h"
-
-#include "net/base/network_change_notifier.h"
-
-namespace {
-
-// The timeout time after which the next tab gets loaded if the previous tab did
-// not finish loading yet. The used value is half of the median value of all
-// ChromeOS devices loading the 25 most common web pages. Half is chosen since
-// the loading time is a mix of server response and data bandwidth.
-static const int kInitialDelayTimerMS = 1500;
-
-class TabLoaderDelegateImpl
-    : public TabLoaderDelegate,
-      public net::NetworkChangeNotifier::ConnectionTypeObserver {
- public:
-  explicit TabLoaderDelegateImpl(TabLoaderCallback* callback);
-  ~TabLoaderDelegateImpl() override;
-
-  // TabLoaderDelegate:
-  base::TimeDelta GetTimeoutBeforeLoadingNextTab() const override {
-    return base::TimeDelta::FromMilliseconds(kInitialDelayTimerMS);
-  }
-
-  // net::NetworkChangeNotifier::ConnectionTypeObserver:
-  void OnConnectionTypeChanged(
-      net::NetworkChangeNotifier::ConnectionType type) override;
-
- private:
-  // The function to call when the connection type changes.
-  TabLoaderCallback* callback_;
-
-  DISALLOW_COPY_AND_ASSIGN(TabLoaderDelegateImpl);
-};
-
-TabLoaderDelegateImpl::TabLoaderDelegateImpl(TabLoaderCallback* callback)
-    : callback_(callback) {
-  net::NetworkChangeNotifier::AddConnectionTypeObserver(this);
-  if (net::NetworkChangeNotifier::IsOffline()) {
-    // When we are off-line we do not allow loading of tabs, since each of
-    // these tabs would start loading simultaneously when going online.
-    // TODO(skuhne): Once we get a higher level resource control logic which
-    // distributes network access, we can remove this.
-    callback->SetTabLoadingEnabled(false);
-  }
-}
-
-TabLoaderDelegateImpl::~TabLoaderDelegateImpl() {
-  net::NetworkChangeNotifier::RemoveConnectionTypeObserver(this);
-}
-
-void TabLoaderDelegateImpl::OnConnectionTypeChanged(
-    net::NetworkChangeNotifier::ConnectionType type) {
-  callback_->SetTabLoadingEnabled(
-      type != net::NetworkChangeNotifier::CONNECTION_NONE);
-}
-}  // namespace
-
-// static
-scoped_ptr<TabLoaderDelegate> TabLoaderDelegate::Create(
-    TabLoaderCallback* callback) {
-  return scoped_ptr<TabLoaderDelegate>(
-      new TabLoaderDelegateImpl(callback));
-}