blob: 8162bb65cf9a6f14b72ecb6320474a1a87b291d5 [file] [log] [blame]
// Copyright 2017 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 <memory>
#include "base/containers/flat_map.h"
#include "base/macros.h"
#include "chrome/browser/ui/browser_list_observer.h"
namespace tab_ranker {
struct WindowFeatures;
} // namespace tab_ranker
// Observes browser window activity in order to log WindowMetrics UKMs for
// browser events relative to tab activation and discarding.
// Multiple tabs in the same browser can refer to the same WindowMetrics entry.
// Must be used on the UI thread.
// TODO(michaelpg): Observe app and ARC++ windows as well.
class WindowActivityWatcher : public BrowserListObserver {
class BrowserWatcher;
// Returns the single instance, creating it if necessary.
static WindowActivityWatcher* GetInstance();
// Returns a populated WindowFeatures for the browser.
static tab_ranker::WindowFeatures CreateWindowFeatures(
const Browser* browser);
~WindowActivityWatcher() override;
bool ShouldTrackBrowser(Browser* browser);
// BrowserListObserver:
void OnBrowserAdded(Browser* browser) override;
void OnBrowserRemoved(Browser* browser) override;
void OnBrowserSetLastActive(Browser* browser) override;
void OnBrowserNoLongerActive(Browser* browser) override;
// Per-browser observers responsible for tracking the tab strip and logging
// new UKM entries on changes.
base::flat_map<Browser*, std::unique_ptr<BrowserWatcher>> browser_watchers_;