Adds database methods needed to track amount of time pages are
actively viewed. If we decide we want this functionality I'll fold it
into segment_usage, but for now I'm putting it in a separate table so
it's easier to migrate.

BUG=none
TEST=covered by tests
[email protected]


Review URL: https://chromiumcodereview.appspot.com/12388003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@185430 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/chrome/browser/about_flags.cc b/chrome/browser/about_flags.cc
index c152db49..a1b70ca 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -1255,6 +1255,13 @@
     kOsAndroid,
     MULTI_VALUE_TYPE(kImplSidePaintingChoices)
   },
+  {
+    "track-active-visit-time",
+    IDS_FLAGS_TRACK_ACTIVE_VISIT_TIME_NAME,
+    IDS_FLAGS_TRACK_ACTIVE_VISIT_TIME_DESCRIPTION,
+    kOsWin,
+    SINGLE_VALUE_TYPE(switches::kTrackActiveVisitTime)
+  },
 };
 
 const Experiment* experiments = kExperiments;