Add Profile metric counting to new User Manager.

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 d1a1a1030dc9e6a44c3401bee9e6867d3cf3900a..d8001fa2c90016a280275dddff80c8209d0c3048 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -15305,6 +15305,13 @@ other types of suffix sets.
   <summary>The number of installed apps when a profile is opened.</summary>
 </histogram>
 
+<histogram name="Profile.AuthResult" enum="ProfileAuth">
+  <summary>
+    Counts of authorization results when trying to open a locked profile from
+    the User Manager.
+  </summary>
+</histogram>
+
 <histogram name="Profile.Avatar" enum="ProfileAvatar">
   <summary>The frequency of selection of each avatar.</summary>
 </histogram>
@@ -29491,6 +29498,14 @@ other types of suffix sets.
   <int value="0" label="Add new user from icon menu"/>
   <int value="1" label="Add new user from title bar menu"/>
   <int value="2" label="Add new user from settings dialog"/>
+  <int value="3" label="Add new user from the User Manager"/>
+</enum>
+
+<enum name="ProfileAuth" type="int">
+  <int value="0" label="Authentication was unnecessary (profile not locked)"/>
+  <int value="1" label="Authentication performed using local credentials"/>
+  <int value="2" label="Authentication performed on-line"/>
+  <int value="3" label="Authentication failed"/>
 </enum>
 
 <enum name="ProfileAvatar" type="int">
@@ -29584,9 +29599,13 @@ other types of suffix sets.
 <enum name="ProfileOpenMethod" type="int">
   <int value="0" label="Opened the avatar bubble menu from NTP"/>
   <int value="1" label="Opened the avatar bubble menu from icon"/>
-  <int value="2" label="Switch profile from icon menu"/>
-  <int value="3" label="Switch profile from title bar menu"/>
-  <int value="4" label="Switch profile from Mac OS X Dock menu"/>
+  <int value="2" label="Switch to profile from icon menu"/>
+  <int value="3" label="Switch to profile from title bar menu"/>
+  <int value="4" label="Switch to profile from Mac OS X Dock menu"/>
+  <int value="5" label="Opened the User Manager"/>
+  <int value="6" label="Switch to profile via User Manager"/>
+  <int value="7" label="Switch to locked profile via User Manager"/>

[msw, 2014/01/29 17:51:58]

nit: make description consistent with the enum's (or vice versa):
  SWITCH_PROFILE_UNLOCK,    // User switches profiles with authentication

[bcwhite, 2014/01/29 19:50:52]

Done.

+  <int value="8" label="Switch to Guest profile"/>
 </enum>
 
 <enum name="ProfileSync" type="int">