Implementing sign-in promo histograms for settings

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 cf9e6766442c612886c2c45d8f47516a55692d31..75142715282554574f3524014b1125b6601f1e9a 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -32519,6 +32519,24 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="MobileSignInPromo.SettingsManager.CountTilSignin">
+  <owner>jlebel@chromium.org</owner>
+  <summary>
+    Counts how many times one of the &quot;sign in&quot; buttons (any of the
+    signed-out &quot;Sign in to Chrome&quot; button, the &quot;Continue as
+    |name|&quot; button, or the &quot;Not |email|?&quot; button) is clicked per
+    impression.
+  </summary>
+</histogram>
+
+<histogram name="MobileSignInPromo.SettingsManager.DismissalCount">
+  <owner>jlebel@chromium.org</owner>
+  <summary>
+    Counts how many times the signin promo is implicitly dismissed (by closing
+    the settings view) per impression.
+  </summary>
+</histogram>
+
 <histogram name="MobileStartup.IntentToCreationTime" units="ms">
   <owner>twellington@chromium.org</owner>
   <summary>