Add ink drop ripple to overview mode button

ash/common/system/chromeos/palette/palette_tray.cc

Index: ash/common/system/chromeos/palette/palette_tray.cc
diff --git a/ash/common/system/chromeos/palette/palette_tray.cc b/ash/common/system/chromeos/palette/palette_tray.cc
index fe7b956db7c9ee74a8fdf7c87b272c5c07a8f636..9e52bea400008e4c6f3e3c67a3997e40f2926f68 100644
--- a/ash/common/system/chromeos/palette/palette_tray.cc
+++ b/ash/common/system/chromeos/palette/palette_tray.cc
@@ -162,7 +162,7 @@ PaletteTray::PaletteTray(WmShelf* wm_shelf)
 
   PaletteTool::RegisterToolInstances(palette_tool_manager_.get());
 
-  SetContentsBackground();
+  SetContentsBackground(true);
 
   SetLayoutManager(new views::FillLayout());
   icon_ = new views::ImageView();
@@ -259,7 +259,7 @@ bool PaletteTray::ShowPalette() {
 
   // Show the bubble.
   bubble_.reset(new ash::TrayBubbleWrapper(this, bubble_view));
-  SetDrawBackgroundAsActive(true);
+  SetIsActive(true);
   return true;
 }
 
@@ -300,7 +300,7 @@ void PaletteTray::HideBubbleWithView(const views::TrayBubbleView* bubble_view) {
 
 void PaletteTray::BubbleViewDestroyed() {
   palette_tool_manager_->NotifyViewsDestroyed();
-  SetDrawBackgroundAsActive(false);
+  SetIsActive(false);
 }
 
 void PaletteTray::OnMouseEnteredView() {}