Implement important sites dialog for desktop.

chrome/browser/engagement/important_sites_util.cc

Index: chrome/browser/engagement/important_sites_util.cc
diff --git a/chrome/browser/engagement/important_sites_util.cc b/chrome/browser/engagement/important_sites_util.cc
index d0280d5f01b4fe788815011bff82fc8323bf4db7..fa56c26bc196293a42e04d827fd83f4ce211dda5 100644
--- a/chrome/browser/engagement/important_sites_util.cc
+++ b/chrome/browser/engagement/important_sites_util.cc
@@ -36,6 +36,7 @@
 namespace {
 using bookmarks::BookmarkModel;
 using ImportantDomainInfo = ImportantSitesUtil::ImportantDomainInfo;
+using ImportantReason = ImportantSitesUtil::ImportantReason;
 
 // Note: These values are stored on both the per-site content settings
 // dictionary and the dialog preference dictionary.
@@ -51,16 +52,6 @@ static const int kTimesIgnoredForBlacklist = 3;
 // bookmarks on site engagement > 0, sort, and trim to kMaxBookmarks.
 static const int kMaxBookmarks = 5;
 
-// Do not change the values here, as they are used for UMA histograms.
-enum ImportantReason {
-  ENGAGEMENT = 0,
-  DURABLE = 1,
-  BOOKMARKS = 2,
-  HOME_SCREEN = 3,
-  NOTIFICATIONS = 4,
-  REASON_BOUNDARY
-};
-
 // We need this to be a macro, as the histogram macros cache their pointers
 // after the first call, so when we change the uma name we check fail if we're
 // just a method.