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

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 7b4d26dddfcbc1d89717a0e0a2d05291d52a6f73..53b32d8a38acae497632cfe81e93e1fdf345141d 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -12828,6 +12828,17 @@ other types of suffix sets.
   </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
@@ -20507,6 +20518,13 @@ other types of suffix sets.
   <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