Animate the app list search box shadow.

ui/app_list/views/search_box_view.h

Index: ui/app_list/views/search_box_view.h
diff --git a/ui/app_list/views/search_box_view.h b/ui/app_list/views/search_box_view.h
index b141da6d1167730649be046b654a9fc7f2ff307a..359b3d20a58dcd588fc66f902352dcb41ff685df 100644
--- a/ui/app_list/views/search_box_view.h
+++ b/ui/app_list/views/search_box_view.h
@@ -9,6 +9,7 @@
 
 #include "ui/app_list/search_box_model_observer.h"
 #include "ui/app_list/speech_ui_model_observer.h"
+#include "ui/gfx/shadow_value.h"
 #include "ui/views/controls/button/image_button.h"
 #include "ui/views/controls/button/menu_button_listener.h"
 #include "ui/views/controls/textfield/textfield_controller.h"
@@ -48,6 +49,9 @@ class APP_LIST_EXPORT SearchBoxView : public views::View,
   void ClearSearch();
   void InvalidateMenu();
 
+  // Sets the shadow border of the search box.
+  void SetShadow(const gfx::ShadowValue& shadow);
+
   // Returns the bounds to use for the view (including the shadow) given the
   // desired bounds of the search box contents.
   gfx::Rect GetViewBoundsForSearchBoxContentsBounds(
@@ -65,6 +69,9 @@ class APP_LIST_EXPORT SearchBoxView : public views::View,
   bool OnMouseWheel(const ui::MouseWheelEvent& event) override;
   void OnEnabledChanged() override;
 
+  // Returns the shadow values for the search box at |z_height|.
+  static gfx::ShadowValue GetShadowForZHeight(int z_height);
+
  private:
   // Updates model text and selection model with current Textfield info.
   void UpdateModel();