Index: ios/chrome/browser/metrics/tab_usage_recorder_web_state_list_observer.h |
diff --git a/ios/chrome/browser/metrics/tab_usage_recorder_web_state_list_observer.h b/ios/chrome/browser/metrics/tab_usage_recorder_web_state_list_observer.h |
new file mode 100644 |
index 0000000000000000000000000000000000000000..96e05f2602ee14b1697fdaf956a2ccfc18ad7a72 |
--- /dev/null |
+++ b/ios/chrome/browser/metrics/tab_usage_recorder_web_state_list_observer.h |
@@ -0,0 +1,32 @@ |
+// 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. |
+ |
+#ifndef IOS_CHROME_BROWSER_METRICS_TAB_USAGE_RECORDER_WEB_STATE_LIST_OBSERVER_H_ |
+#define IOS_CHROME_BROWSER_METRICS_TAB_USAGE_RECORDER_WEB_STATE_LIST_OBSERVER_H_ |
+ |
+#import "ios/shared/chrome/browser/tabs/web_state_list_observer.h" |
+ |
+class TabUsageRecorder; |
+ |
+// Informs the TabUsageRecorder that the active Tab has changed. |
+class TabUsageRecorderWebStateListObserver : public WebStateListObserver { |
+ public: |
+ explicit TabUsageRecorderWebStateListObserver( |
+ TabUsageRecorder* tab_usage_recorder); |
+ ~TabUsageRecorderWebStateListObserver() override; |
+ |
+ private: |
+ // WebStateListObserver implementation. |
+ void WebStateActivatedAt(WebStateList* web_state_list, |
+ web::WebState* old_web_state, |
+ web::WebState* new_web_state, |
+ int active_index, |
+ bool user_action) override; |
+ |
+ TabUsageRecorder* tab_usage_recorder_; |
+ |
+ DISALLOW_COPY_AND_ASSIGN(TabUsageRecorderWebStateListObserver); |
+}; |
+ |
+#endif // IOS_CHROME_BROWSER_METRICS_TAB_USAGE_RECORDER_WEB_STATE_LIST_OBSERVER_H_ |