Apply AnimationDelegateViews to DropdownBarHost

This allows DropdownBarHost animation to be driven by ui::Compositor.
There's no intentional behavior change.

Bug: 953585
Change-Id: Ie2d4ce5666dd8f1d07918083fcbb813e06c1c3c0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1750504
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#686487}

chrome/browser/ui/views/dropdown_bar_host.cc

@@ -23,7 +23,8 @@ bool DropdownBarHost::disable_animations_during_testing_ = false;
 // DropdownBarHost, public:
 
 DropdownBarHost::DropdownBarHost(BrowserView* browser_view)
-    : browser_view_(browser_view),
+    : AnimationDelegateViews(browser_view),
+      browser_view_(browser_view),
       view_(nullptr),
       delegate_(nullptr),
       focus_manager_(nullptr),
@@ -192,7 +193,7 @@ void DropdownBarHost::OnDidChangeFocus(views::View* focused_before,
 }
 
 ////////////////////////////////////////////////////////////////////////////////
-// DropdownBarHost, gfx::AnimationDelegate implementation:
+// DropdownBarHost, views::AnimationDelegateViews implementation:
 
 void DropdownBarHost::AnimationProgressed(const gfx::Animation* animation) {
   // First, we calculate how many pixels to slide the widget.

chrome/browser/ui/views/dropdown_bar_host.h

@@ -10,9 +10,9 @@
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "content/public/browser/native_web_keyboard_event.h"
-#include "ui/gfx/animation/animation_delegate.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/native_widget_types.h"
+#include "ui/views/animation/animation_delegate_views.h"
 #include "ui/views/focus/focus_manager.h"
 #include "ui/views/widget/widget_delegate.h"
 
@@ -40,7 +40,7 @@ class View;
 ////////////////////////////////////////////////////////////////////////////////
 class DropdownBarHost : public ui::AcceleratorTarget,
                         public views::FocusChangeListener,
-                        public gfx::AnimationDelegate,
+                        public views::AnimationDelegateViews,
                         public views::WidgetDelegate {
  public:
   explicit DropdownBarHost(BrowserView* browser_view);
@@ -87,7 +87,7 @@ class DropdownBarHost : public ui::AcceleratorTarget,
   bool AcceleratorPressed(const ui::Accelerator& accelerator) override = 0;
   bool CanHandleAccelerators() const override = 0;
 
-  // gfx::AnimationDelegate implementation:
+  // views::AnimationDelegateViews implementation:
   void AnimationProgressed(const gfx::Animation* animation) override;
   void AnimationEnded(const gfx::Animation* animation) override;