Support Component Actions in the toolbar.

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 84d9004f76a1054c29a588bca645acf83cd020b4..c65c9959e1f96b90298566267c0f93e1c7f6e6b9 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -45924,6 +45924,26 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <summary>Number of retries until the final response was recorded.</summary>
 </histogram>
 
+<histogram name="ToolbarActionsModel.ComponentActionsCount">
+  <owner>rdevlin.cronin@chromium.org</owner>
+  <summary>
+    The number of component action icons the Browser Actions Container knows
+    about (visible or in the overflow bucket). Does not count icons that have
+    been permanently hidden by the user. Measured once per startup per
+    (non-incognito) profile.
+  </summary>
+</histogram>
+
+<histogram name="ToolbarActionsModel.OverallActionsCount">
+  <owner>rdevlin.cronin@chromium.org</owner>
+  <summary>
+    The total number of action icons the Browser Actions Container knows about
+    (visible or in the overflow bucket). Does not count icons that have been
+    permanently hidden by the user. Measured once per startup per
+    (non-incognito) profile.
+  </summary>
+</histogram>
+
 <histogram name="TopSites.NumberOfApplyBlacklist">
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <summary>The number of times TopSitesImpl::ApplyBlacklist is called.</summary>