Add histograms for session startup enum and number of URLs to open.

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 12810 matching lines @@
   </summary>
 </histogram>
 
 <histogram name="Settings.ShowHomeButton" enum="BooleanEnabled">
   <summary>
     Whether or not the Home button is enabled in user preferences when a profile
     is loaded.
   </summary>
 </histogram>
 
+<histogram name="Settings.StartupPageLoadSettings" enum="SessionStartupPref">
+  <summary>Records startup page settings when a profile is loaded.</summary>

[Mark P, 2013/07/30 17:56:57]

nit: Records -> The
(most histogram summaries are simple noun phrases)

[meacer, 2013/07/30 18:41:50]

Done.

+</histogram>
+
+<histogram name="Settings.StartupPageLoadURLs">
+  <summary>
+    Records the number of URLs to be loaded on startup when a profile is loaded,

[Mark P, 2013/07/30 17:56:57]

nit: Records the -> The

[meacer, 2013/07/30 18:41:50]

Done.

+    if the startup page setting is set to load URLs.
+  </summary>
+</histogram>
+
 <histogram name="SimpleCache.CheckCRCResult" enum="CheckCRCResult">
   <summary>
     Whether or not the CRC was checked at the moment when the last reference to
     a read-only entry stream is closed.
   </summary>
 </histogram>
 
 <histogram name="SimpleCache.CreationToIndex" units="milliseconds">
   <summary>
     The time from the creation of the simple cache backend until the index has
@@ skipping 7659 matching lines @@
   <int value="5" label="UPLOAD_FILE_NET_ERROR"/>
   <int value="6" label="UPLOAD_FILE_RESPONSE_ERROR"/>
   <int value="7" label="UPLOAD_COMPLETE_RESPONSE_ERROR"/>
 </enum>
 
 <enum name="ScrollThread" type="int">
   <int value="0" label="Scroll on impl-thread"/>
   <int value="1" label="Scroll on main-thread"/>
 </enum>
 
+<enum name="SessionStartupPref" type="int">
+  <int value="0" label="Open home page (unused)"/>
+  <int value="1" label="Continue from last opened pages"/>
+  <int value="4" label="Open URLs"/>
+  <int value="5" label="Open New tab page"/>

[Mark P, 2013/07/30 17:56:57]

nit: odd capitalization

+</enum>
+
 <enum name="ShillTerminationActionResult" type="int">
   <summary>
     The termination action result types come from TerminationActionResult in
     shill/metrics.h
   </summary>
   <int value="0" label="Success"/>
   <int value="1" label="Failure"/>
 </enum>
 
 <enum name="SideloadUIEvents" type="int">
@@ skipping 3218 matching lines @@
   <group name="Disabled" label="Neither extra webstore link is visible"/>
   <group name="FooterLink" label="Link in bottom right of footer"/>
   <group name="PlusIcon" label="Plus icon in apps page"/>
   <affected-histogram name="Extensions.AppLaunch"/>
   <affected-histogram name="NewTabPage.DefaultPageType"/>
 </fieldtrial>
 
 </fieldtrials>
 
 </histogram-configuration>