Add user action metric for "New Incognito Window" accelerator.

Accel_NewIncognitoWindow is added to record usage of CMD+Shift+N to open
a new Incognito window.

Bug: 1229939
Change-Id: Ife48e403c1415a39a2dcc9c0e887a8c791ead2e2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3034607
Reviewed-by: Bret Sepulveda <bsep@chromium.org>
Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Commit-Queue: Ramin Halavati <rhalavati@chromium.org>
Cr-Commit-Position: refs/heads/master@{#903022}

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

@@ -3506,6 +3506,10 @@ void BrowserView::UpdateAcceleratorMetrics(const ui::Accelerator& accelerator,
       base::RecordAction(base::UserMetricsAction("Accel_NewTabInGroup"));
   }
 
+  if (command_id == IDC_NEW_INCOGNITO_WINDOW) {
+    base::RecordAction(base::UserMetricsAction("Accel_NewIncognitoWindow"));
+  }
+
 #if BUILDFLAG(IS_CHROMEOS_ASH)
   // Collect information about the relative popularity of various accelerators
   // on Chrome OS.

tools/metrics/actions/actions.xml

@@ -867,6 +867,14 @@ 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="Accel_NewIncognitoWindow">
+  <owner>rhalavati@chromium.org</owner>
+  <owner>chrome-incognito@google.com</owner>
+  <description>
+    User pressed CMD+Shift+N to open a new Incognito window.
+  </description>
+</action>
+
 <action name="Accel_NewTab_T">
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <description>Please enter the description of this user action.</description>