Record more holding space pod actions.

New actions include:
- kShowContextMenu
- kShowPreviews
- kHidePreviews

This should tell us how discoverable the holding space pod context menu
is and how often users are enabling/disabling previews.

Bug: 1131266
Change-Id: I2b3d8c02afd6167ee1b516780ac29669e8566b4f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2531495
Commit-Queue: David Black <dmblack@google.com>
Reviewed-by: Toni Baržić <tbarzic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826419}

ash/public/cpp/holding_space/holding_space_metrics.h

@@ -26,7 +26,10 @@ enum class PodAction {
   // kClick (Deprecated) = 0,
   kShow = 1,
   kClose = 2,
-  kMaxValue = kClose,
+  kShowContextMenu = 3,
+  kShowPreviews = 4,
+  kHidePreviews = 5,
+  kMaxValue = kHidePreviews,
 };
 
 // Records the specified `action` taken on the holding space pod in the shelf.

ash/system/holding_space/holding_space_tray.cc

@@ -204,10 +204,16 @@ void HoldingSpaceTray::ExecuteCommand(int command_id, int event_flags) {
   DCHECK(features::IsTemporaryHoldingSpaceContentForwardEntryPointEnabled());
   switch (command_id) {
     case HoldingSpaceCommandId::kHidePreviews:
+      holding_space_metrics::RecordPodAction(
+          holding_space_metrics::PodAction::kHidePreviews);
+
       holding_space_prefs::SetPreviewsEnabled(
           Shell::Get()->session_controller()->GetActivePrefService(), false);
       break;
     case HoldingSpaceCommandId::kShowPreviews:
+      holding_space_metrics::RecordPodAction(
+          holding_space_metrics::PodAction::kShowPreviews);
+
       holding_space_prefs::SetPreviewsEnabled(
           Shell::Get()->session_controller()->GetActivePrefService(), true);
       break;
@@ -223,6 +229,9 @@ void HoldingSpaceTray::ShowContextMenuForViewImpl(
     ui::MenuSourceType source_type) {
   DCHECK(features::IsTemporaryHoldingSpaceContentForwardEntryPointEnabled());
 
+  holding_space_metrics::RecordPodAction(
+      holding_space_metrics::PodAction::kShowContextMenu);
+
   context_menu_model_ = std::make_unique<ui::SimpleMenuModel>(this);
 
   const bool previews_enabled = holding_space_prefs::IsPreviewsEnabled(

tools/metrics/histograms/enums.xml

@@ -36278,6 +36278,9 @@ Called by update_gpu_driver_bug_workaround_entries.py.-->
   <int value="0" label="kClick (Deprecated)"/>
   <int value="1" label="kShow"/>
   <int value="2" label="kClose"/>
+  <int value="3" label="kShowContextMenu"/>
+  <int value="4" label="kShowPreviews"/>
+  <int value="5" label="kHidePreviews"/>
 </enum>
 
 <enum name="HomeButtonPreferenceStateType">