Adding metadata to OverviewButtonTray

This is part of the "Views Posse" effort. See this document:
https://docs.google.com/document/d/1Rst3792TjXtVA8k8GXaPD8MnuB1JAneSOpIILdA4268/edit?usp=sharing

Bug: 1159562
Test: build
Change-Id: Ifdff40cd0fc2a03e01c48accac9b452c55ff3ea3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2600421Reviewed-by: Tetsui Ohkubo <tetsui@chromium.org>
Reviewed-by: Allen Bauer <kylixrd@chromium.org>
Commit-Queue: Shengsong Tan <sstan@google.com>
Cr-Commit-Position: refs/heads/master@{#839039}

ash/system/overview/overview_button_tray.cc

@@ -26,6 +26,7 @@
 #include "ui/views/animation/ink_drop.h"
 #include "ui/views/border.h"
 #include "ui/views/controls/image_view.h"
+#include "ui/views/metadata/metadata_impl_macros.h"
 #include "ui/wm/core/window_util.h"
 
 namespace ash {
@@ -187,10 +188,6 @@ void OverviewButtonTray::HideBubbleWithView(const TrayBubbleView* bubble_view) {
   // This class has no bubbles to hide.
 }
 
-const char* OverviewButtonTray::GetClassName() const {
-  return "OverviewButtonTray";
-}
-
 void OverviewButtonTray::UpdateIconVisibility() {
   // The visibility of the OverviewButtonTray has diverged from
   // OverviewController::CanSelect. The visibility of the button should
@@ -211,4 +208,7 @@ void OverviewButtonTray::UpdateIconVisibility() {
                       !app_mode);
 }
 
+BEGIN_METADATA(OverviewButtonTray, TrayBackgroundView)
+END_METADATA
+
 }  // namespace ash

ash/system/overview/overview_button_tray.h

@@ -13,6 +13,7 @@
 #include "ash/wm/overview/overview_observer.h"
 #include "base/macros.h"
 #include "ui/events/event_constants.h"
+#include "ui/views/metadata/metadata_header_macros.h"
 
 namespace views {
 class ImageView;
@@ -31,6 +32,8 @@ class ASH_EXPORT OverviewButtonTray : public TrayBackgroundView,
                                       public TabletModeObserver,
                                       public ShelfConfig::Observer {
  public:
+  METADATA_HEADER(OverviewButtonTray);
+
   // Second taps within this time will be counted as double taps. Use this
   // instead of ui::Event's click_count and tap_count as those have a minimum
   // time bewtween events before the second tap counts as a double tap.
@@ -41,6 +44,8 @@ class ASH_EXPORT OverviewButtonTray : public TrayBackgroundView,
       base::TimeDelta::FromMilliseconds(300);
 
   explicit OverviewButtonTray(Shelf* shelf);
+  OverviewButtonTray(const OverviewButtonTray&) = delete;
+  OverviewButtonTray& operator=(const OverviewButtonTray&) = delete;
   ~OverviewButtonTray() override;
 
   // Sets the ink drop ripple to ACTIVATED immediately with no animations.
@@ -74,9 +79,6 @@ class ASH_EXPORT OverviewButtonTray : public TrayBackgroundView,
   void HandleLocaleChange() override;
   void HideBubbleWithView(const TrayBubbleView* bubble_view) override;
 
-  // views::View:
-  const char* GetClassName() const override;
-
  private:
   friend class OverviewButtonTrayTest;
 
@@ -92,8 +94,6 @@ class ASH_EXPORT OverviewButtonTray : public TrayBackgroundView,
   // Stores the timestamp of the last tap event time that happened while not
   // in overview mode. Used to check for double taps, which invoke quick switch.
   base::Optional<base::TimeTicks> last_press_event_time_;
-
-  DISALLOW_COPY_AND_ASSIGN(OverviewButtonTray);
 };
 
 }  // namespace ash