[MD History] Copy stats from the old history page.

chrome/browser/resources/md_history/constants.js

Index: chrome/browser/resources/md_history/constants.js
diff --git a/chrome/browser/resources/md_history/constants.js b/chrome/browser/resources/md_history/constants.js
index 9df2c5e6b6f8ec240097b0e3038f03a84396f00b..5ae44b61e0c102b874605467dd009bcbd8d233d9 100644
--- a/chrome/browser/resources/md_history/constants.js
+++ b/chrome/browser/resources/md_history/constants.js
@@ -21,6 +21,19 @@ var BROWSING_GAP_TIME = 15 * 60 * 1000;
 var TITLE_MAX_LENGTH = 300;
 
 /**
+ * The largest bucket value for UMA histogram, based on entry ID. All entries
+ * with IDs greater than this will be included in this bucket.
+ * @const
+ */
+var UMA_MAX_BUCKET_VALUE = 1000;
+
+/**
+ * The largest bucket value for a UMA histogram that is a subset of above.
+ * @const
+ */
+var UMA_MAX_SUBSET_BUCKET_VALUE = 100;
+
+/**
  * Histogram buckets for UMA tracking of which view is being shown to the user.
  * Keep this in sync with the HistoryPageView enum in histograms.xml.
  * This enum is append-only.
@@ -36,6 +49,30 @@ var HistoryPageViewHistogram = {
 };
 
 /**
+ * @const
+ */
+var SYNCED_TABS_HISTOGRAM_NAME = 'HistoryPage.OtherDevicesMenu';
+
+/**
+ * Histogram buckets for UMA tracking of synced tabs.
+ * @const
+ */
+var SyncedTabsHistogram = {
+  INITIALIZED: 0,
+  SHOW_MENU_DEPRECATED: 1,
+  LINK_CLICKED: 2,
+  LINK_RIGHT_CLICKED: 3,
+  SESSION_NAME_RIGHT_CLICKED_DEPRECATED: 4,
+  SHOW_SESSION_MENU: 5,
+  COLLAPSE_SESSION: 6,
+  EXPAND_SESSION: 7,
+  OPEN_ALL: 8,
+  HAS_FOREIGN_DATA: 9,
+  HIDE_FOR_NOW: 10,
+  LIMIT: 11  // Should always be the last one.
+};
+
+/**
  * @enum {number}
  */
 var HistoryRange = {