Add metrics to keep track of the tab activate/deactivate cycle

chrome/chrome_browser.gypi

Index: chrome/chrome_browser.gypi
diff --git a/chrome/chrome_browser.gypi b/chrome/chrome_browser.gypi
index 7b1383e0afb820891be1abf36272fcd419bbd984..2027fa5b121ceca9a12db33622476db4f1707629 100644
--- a/chrome/chrome_browser.gypi
+++ b/chrome/chrome_browser.gypi
@@ -2194,10 +2194,10 @@
       'browser/metrics/chrome_stability_metrics_provider.h',
       'browser/metrics/field_trial_synchronizer.cc',
       'browser/metrics/field_trial_synchronizer.h',
-      'browser/metrics/https_engagement_metrics_provider.cc',
-      'browser/metrics/https_engagement_metrics_provider.h',
       'browser/metrics/google_update_metrics_provider_win.cc',
       'browser/metrics/google_update_metrics_provider_win.h',
+      'browser/metrics/https_engagement_metrics_provider.cc',
+      'browser/metrics/https_engagement_metrics_provider.h',
       'browser/metrics/jumplist_metrics_win.cc',
       'browser/metrics/jumplist_metrics_win.h',
       'browser/metrics/metrics_memory_details.cc',
@@ -2210,6 +2210,8 @@
       'browser/metrics/sampling_metrics_provider.h',
       'browser/metrics/subprocess_metrics_provider.cc',
       'browser/metrics/subprocess_metrics_provider.h',
+      'browser/metrics/tab_usage_recorder.cc',
+      'browser/metrics/tab_usage_recorder.h',
       'browser/metrics/thread_watcher.cc',
       'browser/metrics/thread_watcher.h',
       'browser/metrics/thread_watcher_android.cc',