Add UMA histograms for home page, start page, and DSE hosts.

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 4aa4b2d69ec770bda511ec9912331ea769ad0811..3c116799760856d84c90650aa833b8e45b7fe68d 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -3878,6 +3878,20 @@ other types of suffix sets.
   </summary>
 </histogram>
 
+<histogram name="HomePage.IsHomeButtonEnabled" enum="BooleanEnabled">

[Mark P, 2013/07/26 23:30:23]

You do not use either this histogram or the one below in your code.  Please
remove them.

[bbudge, 2013/07/27 01:33:01]

Leftover from a previous version where I based off another patch. Done.

+  <summary>
+    Whether or not the Home button is enabled in user preferences when a profile
+    is loaded.
+  </summary>
+</histogram>
+
+<histogram name="HomePage.IsNewTabPage" enum="Boolean">
+  <summary>
+    Whether or not the home page user preference is set to the default NTP value
+    when a profile is loaded.
+  </summary>
+</histogram>
+
 <histogram name="HttpCache.EntryLockWait" units="milliseconds">
   <summary>
     The time spent waiting for write lock on a disk cache entry.
@@ -12730,6 +12744,20 @@ other types of suffix sets.
   </summary>
 </histogram>
 
+<histogram name="Settings.DefaultSearchProvider" enum="OmniboxSearchEngine">
+  <summary>
+    The id of the default search engine URL host that is specified in

[Mark P, 2013/07/26 23:30:23]

Please describe when this is emitted.

(ditto other histograms below)

[bbudge, 2013/07/27 01:33:01]

Done.

+    Preferences.
+  </summary>
+</histogram>
+
+<histogram name="Settings.FirstStartPageURL" enum="OmniboxSearchEngine">
+  <summary>
+    The id of the first start page URL host that is specified in Preferences.

[Mark P, 2013/07/26 23:30:23]

Please revise this comment; it no longer matches the code.

[bbudge, 2013/07/27 01:33:01]

Done.

+    The first start page is the active tab at startup.
+  </summary>
+</histogram>
+
 <histogram name="Settings.HomePageIsNewTabPage" enum="Boolean">
   <summary>
     Whether or not the home page user preference is set to the default NTP value
@@ -12737,6 +12765,12 @@ other types of suffix sets.
   </summary>
 </histogram>
 
+<histogram name="Settings.HomePageURL" enum="OmniboxSearchEngine">
+  <summary>
+    The id of the home page URL host that is specified in Preferences.
+  </summary>
+</histogram>
+
 <histogram name="Settings.ShowHomeButton" enum="BooleanEnabled">
   <summary>
     Whether or not the Home button is enabled in user preferences when a profile
@@ -19499,6 +19533,19 @@ other types of suffix sets.
   <int value="99" label="Spray"/>
   <int value="100" label="Sanook!"/>
   <int value="101" label="MYNET"/>
+  <int value="102" label="searchnu.com"/>
+  <int value="103" label="babylon.com"/>
+  <int value="104" label="delta-search.com"/>
+  <int value="105" label="iminent.com"/>
+  <int value="106" label="hao123.com"/>
+  <int value="107" label="sweetim.com"/>
+  <int value="108" label="snap.do"/>
+  <int value="109" label="snapdo.com"/>
+  <int value="110" label="softonic.com"/>
+  <int value="111" label="searchfunmoods.com"/>
+  <int value="112" label="incredibar.com"/>
+  <int value="113" label="sweetpacks.com"/>
+  <int value="114" label="imesh.net"/>
 </enum>
 
 <enum name="OmniboxSuggestRequests" type="int">