Add UMA for how many times the hosted app menu button are clicked.

Per the PM's request, add UMA to record how many times the hosted app
menu button are clicked.

Bug: None
Change-Id: Ib52f936ce5029bf7c23ed15f14f724db665d81f9
Reviewed-on: https://chromium-review.googlesource.com/1214084
Commit-Queue: Xiaoqian Dai <xdai@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589739}

chrome/browser/ui/views/frame/hosted_app_menu_button.cc

@@ -4,6 +4,7 @@
 
 #include "chrome/browser/ui/views/frame/hosted_app_menu_button.h"
 
+#include "base/metrics/user_metrics.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/time/time.h"
 #include "chrome/app/vector_icons/vector_icons.h"
@@ -73,6 +74,10 @@ void HostedAppMenuButton::OnMenuButtonClicked(views::MenuButton* source,
            browser, AppMenu::NO_FLAGS);
 
   menu()->RunMenu(this);
+
+  // Add UMA for how many times the hosted app menu button are clicked.
+  base::RecordAction(
+      base::UserMetricsAction("HostedAppMenuButtonButton_Clicked"));
 }
 
 void HostedAppMenuButton::FadeHighlightOff() {

tools/metrics/actions/actions.xml

@@ -5815,6 +5815,14 @@ should be able to be added at any place in this file.
   <description>Please enter the description of this user action.</description>
 </action>
 
+<action name="HostedAppMenuButtonButton_Clicked">
+  <owner>xdai@chromium.org</owner>
+  <owner>omrilio@chromium.org</owner>
+  <description>
+    Recorded when the user clicks on the app menu button on a hosted app.
+  </description>
+</action>
+
 <action name="Hotword.HotwordTrigger">
   <obsolete>
     Deprecated as of 10/2017. Feature removed with crbug/761426.