New Profile metric for Auth Errors.

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 6a2c26fcc6bed77f1899a56205c5cbe18f40233b..9b659fdc0eae97d6e9aa7d332c879ceb126218f8 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -27601,6 +27601,14 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   </summary>
 </histogram>
 
+<histogram name="Profile.NumberOfProfileAuthErrors">
+  <owner>mlerman@chromium.org</owner>
+  <summary>
+    Counts the type GAIA Auth Errors on a user's machine when Chrome starts up.

[noms (inactive), 2015/01/08 21:49:04]

nit: I don't think we need to capitalize error. And maybe use "Authentication"
instead? Here and below

[Mike Lerman, 2015/01/09 02:15:05]

Done.

+    The types of Auth Errors are broken down in Signin.AuthError.
+  </summary>
+</histogram>
+
 <histogram name="Profile.NumberOfProfiles">
   <owner>bcwhite@chromium.org</owner>
   <owner>rlp@chromium.org</owner>
@@ -32493,6 +32501,13 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   <summary>Track how a user interfacts with the android signin promo.</summary>
 </histogram>
 
+<histogram name="Signin.AuthError" enum="GoogleServiceAuthError">
+  <owner>mlerman@chromium.org</owner>
+  <summary>
+    Log the type of GAIA Auth Error that occur whenever the error state changes.
+  </summary>
+</histogram>
+
 <histogram name="Signin.DuringFirstRun">
   <owner>mlerman@chromium.org</owner>
   <summary>