Deeper histogram for SQLITE_IOERR.

tools/metrics/histograms/histograms.xml

 <!--
 Copyright 2013 The Chromium Authors. All rights reserved.
 Use of this source code is governed by a BSD-style license that can be
 found in the LICENSE file.
 -->
 
 <!--
 This file is used to generate a comprehensive list of Chrome histograms along
 with a detailed description for each histogram.
 
@@ skipping 5731 matching lines @@
 </histogram>
 
 <histogram name="Sqlite.DomStorageDatabase.Error" enum="SqliteErrorCode">
   <summary>Error codes returned by sqlite for the domstorage db.</summary>
 </histogram>
 
 <histogram name="Sqlite.Error" enum="SqliteErrorCode">
   <summary>Error codes returned by sqlite for all databases.</summary>
 </histogram>
 
+<histogram name="Sqlite.Error.IOERR" enum="SqliteIOERRCode">
+  <summary>Error codes returned by sqlite for all databases.</summary>
+</histogram>
+
 <histogram name="Sqlite.History.Error" enum="SqliteErrorCode">
   <summary>Error codes returned by sqlite for the history db.</summary>
 </histogram>
 
 <histogram name="Sqlite.Quota.Error" enum="SqliteErrorCode">
   <summary>Error codes returned by sqlite for the quota db.</summary>
 </histogram>
 
 <histogram name="Sqlite.Text.Error" enum="SqliteErrorCode">
   <summary>Error codes returned by sqlite the full text db.</summary>
@@ skipping 3395 matching lines @@
   </int>
   <int value="26" label="SQLITE_NOTADB">
     File opened that is not a database file
   </int>
   <int value="100" label="SQLITE_ROW">sqlite3_step() has another row ready</int>
   <int value="101" label="SQLITE_DONE">
     sqlite3_step() has finished executing
   </int>
 </enum>
 
+<enum name="SqliteIOERRCode" type="int">
+  <summary>Extended error codes returned by SQLite - see sqlite.h</summary>
+  <int value="0" label="SQLITE_IOERR">No extended code given</int>
+  <int value="1" label="SQLITE_IOERR_READ">Error reading from file</int>
+  <int value="2" label="SQLITE_IOERR_SHORT_READ">Short read from file</int>
+  <int value="3" label="SQLITE_IOERR_WRITE">
+    Error writing to file (other than SQLITE_FULL)
+  </int>
+  <int value="4" label="SQLITE_IOERR_FSYNC">Error syncing to disk</int>
+  <int value="5" label="SQLITE_IOERR_DIR_FSYNC">
+    Error syncing directory changes to disk
+  </int>
+  <int value="6" label="SQLITE_IOERR_TRUNCATE">Error truncating file</int>
+  <int value="7" label="SQLITE_IOERR_FSTAT">Error reading file metadata</int>
+  <int value="8" label="SQLITE_IOERR_UNLOCK">Error unlocking file</int>
+  <int value="9" label="SQLITE_IOERR_RDLOCK">
+    Error getting read lock - should not be possible
+  </int>
+  <int value="10" label="SQLITE_IOERR_DELETE">Error deleting file</int>
+  <int value="11" label="SQLITE_IOERR_BLOCKED">
+    Deadlock due to other process access to SQLite files
+  </int>
+  <int value="12" label="SQLITE_IOERR_NOMEM">Error mapping shared memory</int>
+  <int value="13" label="SQLITE_IOERR_ACCESS">
+    Error getting file attributes (other than not found)
+  </int>
+  <int value="14" label="SQLITE_IOERR_CHECKRESERVEDLOCK">
+    Error while querying lock status
+  </int>
+  <int value="15" label="SQLITE_IOERR_LOCK">Error acquiring lock</int>
+  <int value="16" label="SQLITE_IOERR_CLOSE">Error closing file</int>
+  <int value="17" label="SQLITE_IOERR_DIR_CLOSE">Unused</int>
+  <int value="18" label="SQLITE_IOERR_SHMOPEN">Error mmapping file</int>
+  <int value="19" label="SQLITE_IOERR_SHMSIZE">
+    Error in stat while mmapping file
+  </int>
+  <int value="20" label="SQLITE_IOERR_SHMLOCK">Unused</int>
+</enum>
+
 <enum name="TcpSocketStatus" type="int">
   <int value="0" label="Unknown"/>
   <int value="1" label="Fast Connection Return"/>
   <int value="2" label="Slow Connection Return"/>
   <int value="3" label="Connection Error"/>
   <int value="4" label="Syn Data Acknowledged"/>
   <int value="5" label="Syn Data Nacked"/>
   <int value="6" label="Syn Data Probe Failed"/>
   <int value="7" label="No syn data + ack (can't happen)"/>
   <int value="8" label="No syn data + nack"/>
@@ skipping 1275 matching lines @@
 <fieldtrial name="SSLResumption">
   <group name="Resume_Handshake" label="Session Resumption"/>
   <group name="Full_Handshake" label="Full"/>
   <affected-histogram name="Net.SSL_Connection_Latency"/>
   <affected-histogram name="Net.SSL_Connection_Latency_Google"/>
 </fieldtrial>
 
 </fieldtrials>
 
 </histogram-configuration>