History init: add metrics and skip migration.

tools/metrics/histograms/histograms.xml

Index: tools/metrics/histograms/histograms.xml
diff --git a/tools/metrics/histograms/histograms.xml b/tools/metrics/histograms/histograms.xml
index 5a6b1ad2fdda81e89d18eb36b51790756ce68e57..459f8d03bdeded05ef2d0548b016bc31b058ff70 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -22605,6 +22605,20 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="History.AttemptedToFixProfileError">
+  <owner>brettw@chromium.org</owner>
+  <summary>
+    Logged whenever history database initialization fails. The frequency of
+    logging will tell you the total failure rate. True indicate that we think
+    the database is non-recoverable and it will be deleted. It should be
+    re-created the next time Chrome is started. False indicates we think the
+    error is temporary (like out of disk space or file locked). Chrome will run
+    with no history database and nothing will be done to try to fix the error.
+    See History.InitializationFailureStep for which particular step of history
+    initialization failed.
+  </summary>
+</histogram>
+
 <histogram
     name="History.ClearBrowsingData.HistoryNoticeShownInFooterWhenUpdated"
     enum="BooleanShown">
@@ -22832,6 +22846,16 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="History.InitializationFailureStep" enum="HistoryInitStep">
+  <owner>brettw@chromium.org</owner>
+  <summary>
+    The phase of history initialization that failed. This histogram is only
+    logged on database initialization failure.
+    History.AttemptedToFixProfileError will tell how often initialization fails
+    overall.
+  </summary>
+</histogram>
+
 <histogram name="History.InMemoryDBItemCount">
   <owner>gab@chromium.org</owner>
   <summary>
@@ -22956,6 +22980,15 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="History.MigrateFailureFromVersion">
+  <owner>brettw@chromium.org</owner>
+  <summary>
+    History database version from which history migration failed. If there are
+    higher than normal migration failures, this histogram will indicate which
+    migration step failed.
+  </summary>
+</histogram>
+
 <histogram name="History.MonthlyHostCount">
   <owner>shess@chromium.org</owner>
   <summary>
@@ -98586,6 +98619,15 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </int>
 </enum>
 
+<enum name="HistoryInitStep" type="int">
+  <int value="0" label="Open"/>
+  <int value="1" label="Transaction begin"/>
+  <int value="2" label="Meta table init"/>
+  <int value="3" label="Create tables"/>
+  <int value="4" label="Version check and migration (check History.MigrateFailureToVersion)"/>
+  <int value="5" label="Commit"/>
+</enum>
+
 <enum name="HistoryPageView" type="int">
   <int value="0" label="History"/>
   <int value="1" label="Grouped Week (Obsolete Feb. 2017)"/>